docs: Fix Markdown rendering issues

- Fix rendering issues of multi-line HTML comments (license headers)
- Fix rendering issues of footnotes

Change-Id: I06c8ad3454a62187e9d527df62560b897ec478f4
Signed-off-by: David Vincze <david.vincze@linaro.org>
diff --git a/docs/PORTING.md b/docs/PORTING.md
index bf68d6d..61a4f8d 100644
--- a/docs/PORTING.md
+++ b/docs/PORTING.md
@@ -144,7 +144,7 @@
 needs to provide this pair of function.
 
 To configure the what functions are called when allocating/deallocating
-memory `mbed TLS` uses the following call [^cite1]:
+memory `mbed TLS` uses the following call [^1]:
 
 ```
 int mbedtls_platform_set_calloc_free (void *(*calloc_func)(size_t, size_t),
@@ -155,4 +155,4 @@
 can be used directly here, otherwise create new functions that glue to
 your `calloc/free` implementations.
 
-[^cite1]```https://tls.mbed.org/api/platform_8h.html```
+[^1]: ```https://tls.mbed.org/api/platform_8h.html```
diff --git a/docs/design.md b/docs/design.md
index 5ff22d1..6301d91 100644
--- a/docs/design.md
+++ b/docs/design.md
@@ -1,24 +1,26 @@
 <!--
-  Licensed to the Apache Software Foundation (ASF) under one
-  or more contributor license agreements.  See the NOTICE file
-  distributed with this work for additional information
-  regarding copyright ownership.  The ASF licenses this file
-  to you under the Apache License, Version 2.0 (the
-  "License"); you may not use this file except in compliance
-  with the License.  You may obtain a copy of the License at
-
-   http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing,
-  software distributed under the License is distributed on an
-  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-  KIND, either express or implied.  See the License for the
-  specific language governing permissions and limitations
-  under the License.
+    -
+    - Licensed to the Apache Software Foundation (ASF) under one
+    - or more contributor license agreements.  See the NOTICE file
+    - distributed with this work for additional information
+    - regarding copyright ownership.  The ASF licenses this file
+    - to you under the Apache License, Version 2.0 (the
+    - "License"); you may not use this file except in compliance
+    - with the License.  You may obtain a copy of the License at
+    -
+    -  http://www.apache.org/licenses/LICENSE-2.0
+    -
+    - Unless required by applicable law or agreed to in writing,
+    - software distributed under the License is distributed on an
+    - "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    - KIND, either express or implied.  See the License for the
+    - specific language governing permissions and limitations
+    - under the License.
+    -
 -->
 
 <!--
-  Modifications are Copyright (c) 2019-2020 Arm Limited.
+    - Modifications are Copyright (c) 2019-2020 Arm Limited.
 -->
 
 # Boot Loader
diff --git a/docs/encrypted_images.md b/docs/encrypted_images.md
index 497634a..4bc7f86 100644
--- a/docs/encrypted_images.md
+++ b/docs/encrypted_images.md
@@ -1,22 +1,22 @@
 <!--
-#
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing,
-# software distributed under the License is distributed on an
-# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-#  KIND, either express or implied.  See the License for the
-# specific language governing permissions and limitations
-# under the License.
-#
+    -
+    - Licensed to the Apache Software Foundation (ASF) under one
+    - or more contributor license agreements.  See the NOTICE file
+    - distributed with this work for additional information
+    - regarding copyright ownership.  The ASF licenses this file
+    - to you under the Apache License, Version 2.0 (the
+    - "License"); you may not use this file except in compliance
+    - with the License.  You may obtain a copy of the License at
+    -
+    -  http://www.apache.org/licenses/LICENSE-2.0
+    -
+    - Unless required by applicable law or agreed to in writing,
+    - software distributed under the License is distributed on an
+    - "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    - KIND, either express or implied.  See the License for the
+    - specific language governing permissions and limitations
+    - under the License.
+    -
 -->
 
 # Encrypted images
diff --git a/docs/signed_images.md b/docs/signed_images.md
index 80bac7b..46d4415 100644
--- a/docs/signed_images.md
+++ b/docs/signed_images.md
@@ -1,22 +1,22 @@
 <!--
-#
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing,
-# software distributed under the License is distributed on an
-# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-#  KIND, either express or implied.  See the License for the
-# specific language governing permissions and limitations
-# under the License.
-#
+    -
+    - Licensed to the Apache Software Foundation (ASF) under one
+    - or more contributor license agreements.  See the NOTICE file
+    - distributed with this work for additional information
+    - regarding copyright ownership.  The ASF licenses this file
+    - to you under the Apache License, Version 2.0 (the
+    - "License"); you may not use this file except in compliance
+    - with the License.  You may obtain a copy of the License at
+    -
+    -  http://www.apache.org/licenses/LICENSE-2.0
+    -
+    - Unless required by applicable law or agreed to in writing,
+    - software distributed under the License is distributed on an
+    - "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    - KIND, either express or implied.  See the License for the
+    - specific language governing permissions and limitations
+    - under the License.
+    -
 -->
 
 ## Image signing