Doc: convert markdown files to rst

The official documentation format for TF-M is becoming Restructured
Text. This change converts the existing .md files to the new format.

Due to support for documentation of external code (/lib) md support is
kept.

Change-Id: I3c1aef5d22442e0c7c362a40a8d344a266dc0940
Signed-off-by: Gyorgy Szing <Gyorgy.Szing@arm.com>
diff --git a/cmake/SphinxCopyDoc.cmake b/cmake/SphinxCopyDoc.cmake
index c1f7731..ff21c8d 100644
--- a/cmake/SphinxCopyDoc.cmake
+++ b/cmake/SphinxCopyDoc.cmake
@@ -25,7 +25,7 @@
 #    |
 #
 #Usage:
-#   cmake -DDST_RIR=<path to destination> -DTFM_ROOT_DIR=<path to tf-m root> \
+#   cmake -DDST_DIR=<path to destination> -DTFM_ROOT_DIR=<path to tf-m root> \
 #          -P SphinxCopyDoc.cmake
 
 #Check input parameters
@@ -42,7 +42,8 @@
 		LIST_DIRECTORIES false
 		RELATIVE "${TFM_ROOT_DIR}"
 		"${TFM_ROOT_DIR}/*.md"
-		"${TFM_ROOT_DIR}/*.rst")
+		"${TFM_ROOT_DIR}/*.rst"
+		"${TFM_ROOT_DIR}/dco.txt")
 
 #Subtract exluded files from copy files
 list(REMOVE_ITEM _COPY_FILES "docs/index.rst")