Merge changes from topic "mp/update_release_timelines" into integration

* changes:
  docs: update release information for v2.6
  docs: update code freeze & target date for v2.5

docs/about/release-information.rst

@@ -44,7 +44,9 @@ depending on project requirement and partner feedback.
 +-----------------+---------------------------+------------------------------+
 | v2.4            | 2nd week of Nov '20       | 4th week of Oct '20          |
 +-----------------+---------------------------+------------------------------+
-| v2.5            | 2nd week of May '21       | 4th week of Apr '21          |
+| v2.5            | 3rd week of May '21       | 5th week of Apr '21          |
++-----------------+---------------------------+------------------------------+
+| v2.6            | 4th week of Oct '21       | 1st week of Oct '21          |
 +-----------------+---------------------------+------------------------------+
 
 Removal of Deprecated Interfaces
@@ -64,4 +66,4 @@ Release version after which it will be removed.
 
 --------------
 
-*Copyright (c) 2018-2020, Arm Limited and Contributors. All rights reserved.*
+*Copyright (c) 2018-2021, Arm Limited and Contributors. All rights reserved.*