Fix some typos in comments.

[ci skip]

actionpack/lib/action_controller/metal/renderers.rb

@@ -103,7 +103,7 @@ module ActionController
       #
       # Both <tt>ActionController::Base</tt> and <tt>ActionController::API</tt>
       # include <tt>ActionController::Renderers::All</tt>, making all renderers
-      # avaialable in the controller. See <tt>Renderers::RENDERERS</tt> and <tt>Renderers.add</tt>.
+      # available in the controller. See <tt>Renderers::RENDERERS</tt> and <tt>Renderers.add</tt>.
       #
       # Since <tt>ActionController::Metal</tt> controllers cannot render, the controller
       # must include <tt>AbstractController::Rendering</tt>, <tt>ActionController::Rendering</tt>,

activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb

@@ -541,7 +541,7 @@ module ActiveRecord
           result = exec_query(sql, 'SCHEMA').first
 
           if result
-            # Splitting with left parantheses and picking up last will return all
+            # Splitting with left parentheses and picking up last will return all
             # columns separated with comma(,).
             columns_string = result["sql"].split('(').last
 

activerecord/test/cases/connection_adapters/type_lookup_test.rb

@@ -1,6 +1,6 @@
 require "cases/helper"
 
-unless current_adapter?(:PostgreSQLAdapter) # PostgreSQL does not use type strigns for lookup
+unless current_adapter?(:PostgreSQLAdapter) # PostgreSQL does not use type strings for lookup
 module ActiveRecord
   module ConnectionAdapters
     class TypeLookupTest < ActiveRecord::TestCase

activerecord/test/cases/scoping/named_scoping_test.rb

@@ -301,7 +301,7 @@ class NamedScopingTest < ActiveRecord::TestCase
       :relation,      # private class method on AR::Base
       :new,           # redefined class method on AR::Base
       :all,           # a default scope
-      :public,        # some imporant methods on Module and Class
+      :public,        # some important methods on Module and Class
       :protected,
       :private,
       :name,

activesupport/test/core_ext/object/json_gem_encoding_test.rb

@@ -10,7 +10,7 @@ require 'json/encoding_test_cases'
 
 # The AS::JSON encoder requires the BigDecimal core_ext, which, unfortunately,
 # changes the BigDecimal#to_s output, and consequently the JSON gem output. So
-# we need to require this unfront to ensure we don't get a false failure, but
+# we need to require this upfront to ensure we don't get a false failure, but
 # ideally we should just fix the BigDecimal core_ext to not change to_s without
 # arguments.
 require 'active_support/core_ext/big_decimal'

ci/travis.rb

@@ -120,7 +120,7 @@ class Build
 
   def env
     if activesupport? && !isolated?
-      # There is a known issue with the listen tests that casuses files to be
+      # There is a known issue with the listen tests that causes files to be
       # incorrectly GC'ed even when they are still in-use. The current is to
       # only run them in isolation to avoid randomly failing our test suite.
       { 'LISTEN' => '0' }

railties/lib/rails/engine.rb

@@ -219,7 +219,7 @@ module Rails
   # The next thing that changes in isolated engines is the behavior of routes.
   # Normally, when you namespace your controllers, you also need to namespace
   # the related routes. With an isolated engine, the engine's namespace is
-  # automatically applied, so you don't need to specify it explicity in your
+  # automatically applied, so you don't need to specify it explicitly in your
   # routes:
   #
   #   MyEngine::Engine.routes.draw do

railties/test/application/configuration_test.rb

@@ -686,7 +686,7 @@ module ApplicationTests
 
         private
 
-        def form_authenticity_token(*args); token; end # stub the authenticy token
+        def form_authenticity_token(*args); token; end # stub the authenticity token
       end
       RUBY