Merge pull request #24494 from vipulnsward/guides-changelog-pass

Guides changelog pass [ci skip]

guides/CHANGELOG.md

 *   Update example of passing a proc to `:message` option for validating records.
 
-    This behavior was recently changed in https://github.com/rails/rails/pull/24119 to
-    pass the object being validated as first argument to the `:message` proc
-    instead of key of the field being validated.
+    This behavior was recently changed in [Pull Request #24199](https://github.com/rails/rails/pull/24119) to
+    pass the object being validated as first argument to the `:message` proc,
+    instead of the key of the field being validated.
+    
+    *Prathamesh Sonpatki*
 
+*   Added new guide: Action Cable Overview.   
+
+    *David Kuhta*
+
+ 
 ## Rails 5.0.0.beta3 (February 24, 2016) ##
 
 *   No changes.
@@ -16,23 +23,23 @@
 
 ## Rails 5.0.0.beta1 (December 18, 2015) ##
 
-*   Add code of conduct to contributing guide
+*   Add code of conduct to contributing guide.
 
     *Jon Moss*
 
-*   New section in Configuring: Configuring Active Job
+*   New section in Configuring: Configuring Active Job.
 
     *Eliot Sykes*
 
-*   New section in Active Record Association Basics: Single Table Inheritance
+*   New section in Active Record Association Basics: Single Table Inheritance.
 
     *Andrey Nering*
 
-*   New section in Active Record Querying: Understanding The Method Chaining
+*   New section in Active Record Querying: Understanding The Method Chaining.
 
     *Andrey Nering*
 
-*   New section in Configuring: Search Engines Indexing
+*   New section in Configuring: Search Engines Indexing.
 
     *Andrey Nering*