[skip ci] fix tiny typo

Author: shunyama

activesupport/lib/active_support/core_ext/date_and_time/compatibility.rb

@@ -15,7 +15,7 @@ module Compatibility
 
     # Change the output of <tt>ActiveSupport::TimeZone.utc_to_local</tt>.
     #
-    # When `true`, it returns local times with an UTC offset, with `false` local
+    # When `true`, it returns local times with a UTC offset, with `false` local
     # times are returned as UTC.
     #
     #   # Given this zone:

activesupport/lib/active_support/inflector/methods.rb

@@ -109,7 +109,7 @@ def underscore(camel_cased_word)
     #
     # * Applies human inflection rules to the argument.
     # * Deletes leading underscores, if any.
-    # * Removes a "_id" suffix if present.
+    # * Removes an "_id" suffix if present.
     # * Replaces underscores with spaces, if any.
     # * Downcases all words except acronyms.
     # * Capitalizes the first word.