Add missing punctuation mark in `ActiveSupport` docs [ci skip]

It improves readability of docs

activesupport/lib/active_support/dependencies.rb

@@ -25,21 +25,21 @@ module Dependencies #:nodoc:
     # :doc:
 
     # Execute the supplied block without interference from any
-    # concurrent loads
+    # concurrent loads.
     def self.run_interlock
       Dependencies.interlock.running { yield }
     end
 
     # Execute the supplied block while holding an exclusive lock,
     # preventing any other thread from being inside a #run_interlock
-    # block at the same time
+    # block at the same time.
     def self.load_interlock
       Dependencies.interlock.loading { yield }
     end
 
     # Execute the supplied block while holding an exclusive lock,
     # preventing any other thread from being inside a #run_interlock
-    # block at the same time
+    # block at the same time.
     def self.unload_interlock
       Dependencies.interlock.unloading { yield }
     end

activesupport/lib/active_support/gem_version.rb

 module ActiveSupport
-  # Returns the version of the currently loaded Active Support as a <tt>Gem::Version</tt>
+  # Returns the version of the currently loaded Active Support as a <tt>Gem::Version</tt>.
   def self.gem_version
     Gem::Version.new VERSION::STRING
   end

activesupport/lib/active_support/key_generator.rb

@@ -2,7 +2,7 @@
 require 'openssl'
 
 module ActiveSupport
-  # KeyGenerator is a simple wrapper around OpenSSL's implementation of PBKDF2
+  # KeyGenerator is a simple wrapper around OpenSSL's implementation of PBKDF2.
   # It can be used to derive a number of keys for various purposes from a given secret.
   # This lets Rails applications have a single secure secret, but avoid reusing that
   # key in multiple incompatible contexts.
@@ -24,7 +24,7 @@ def generate_key(salt, key_size=64)
 
   # CachingKeyGenerator is a wrapper around KeyGenerator which allows users to avoid
   # re-executing the key generation process when it's called using the same salt and
-  # key_size
+  # key_size.
   class CachingKeyGenerator
     def initialize(key_generator)
       @key_generator = key_generator

activesupport/lib/active_support/log_subscriber.rb

@@ -3,7 +3,7 @@
 require 'active_support/subscriber'
 
 module ActiveSupport
-  # ActiveSupport::LogSubscriber is an object set to consume
+  # ActiveSupport::LogSubscriber is an object set to consume.
   # ActiveSupport::Notifications with the sole purpose of logging them.
   # The log subscriber dispatches notifications to a registered object based
   # on its given namespace.