Docs: A bunch of small fixes

- remove "Migration from legacy buildsystem" as obsolete
- update the list of topics in Contribution guide
- update broken links in the Glossary
- add a link to TF-M forum in introduction
- update "Code Sharing" guide
- change warning of usage the default keys
- update mbedTLS repository URL

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: I8a2fa1802fddfa0a098f3999c0fffb5d0d003d06
diff --git a/docs/contributing/code_review_guide.rst b/docs/contributing/code_review_guide.rst
index 72df4b3..fa36cf7 100644
--- a/docs/contributing/code_review_guide.rst
+++ b/docs/contributing/code_review_guide.rst
@@ -210,7 +210,7 @@
 ============== ====================================================
 Topic          Justification
 ============== ====================================================
-Boot           bl2/*
+Boot           `bl2/*` or `bl1/*`
 Build          For build system related purpose.
 Docs           All \*.rst changes.
 Dualcpu        Dual-cpu related changes.
@@ -222,8 +222,9 @@
 Partition Name Specific partition related changes.
 Service        Multiple service related changes.
 Service Name   Specific service related changes.
-SPM            secure_fw/spm/*
-SPRTL          secure-fw/partitions/lib/runtime/*
+SPM            `secure_fw/spm/*`
+SPRTL          `secure-fw/partitions/lib/runtime/*`
+Tool           `tools` folder or `tf-m-tools` repo
 ============== ====================================================
 
 .. note::
@@ -234,4 +235,4 @@
 
 --------------
 
-*Copyright (c) 2020-2021, Arm Limited. All rights reserved.*
+*Copyright (c) 2020-2022, Arm Limited. All rights reserved.*