Correct Hash#assert_valid_keys docs. Closes #10621 [Cheah Chu Yeow, blackanger]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8521 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/lib/active_support/core_ext/hash/keys.rb

@@ -38,11 +38,12 @@ def symbolize_keys!
         alias_method :to_options!, :symbolize_keys!
 
         # Validate all keys in a hash match *valid keys, raising ArgumentError on a mismatch.
-        # Note that keys are NOT treated indifferently, meaning if you use strings for keys but assert symbol
+        # Note that keys are NOT treated indifferently, meaning if you use strings for keys but assert symbols
         # as keys, this will fail.
-        # examples:
+        #
+        # ==== Examples:
         #   { :name => "Rob", :years => "28" }.assert_valid_keys(:name, :age) # => raises "ArgumentError: Unknown key(s): years"
-        #   { :name => "Rob", :age => "28" }.assert_valid_keys("name", "age") # => raises "ArgumentError: Unknown key(s): years, name"
+        #   { :name => "Rob", :age => "28" }.assert_valid_keys("name", "age") # => raises "ArgumentError: Unknown key(s): name, age"
         #   { :name => "Rob", :age => "28" }.assert_valid_keys(:name, :age) # => passes, raises nothing
         def assert_valid_keys(*valid_keys)
           unknown_keys = keys - [valid_keys].flatten