doc: RAS: fixing broken links

There were some links in the file "ras.rst" which were broken, this
patch fixes all the broken links in this file.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: I00cf080e9338af5786239a4843cb4c2e0cc9d99d
diff --git a/docs/components/exception-handling.rst b/docs/components/exception-handling.rst
index 4cca5f4..4c63a8b 100644
--- a/docs/components/exception-handling.rst
+++ b/docs/components/exception-handling.rst
@@ -176,6 +176,8 @@
 
 Dispatchers are assigned interrupt priority levels in two steps:
 
+.. _Partitioning priority levels:
+
 Partitioning priority levels
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -365,6 +367,8 @@
 
 See also the `Build-time flow`_ and the `Run-time flow`_.
 
+.. _Activating and Deactivating priorities:
+
 Activating and Deactivating priorities
 --------------------------------------