Fixed typo [ci skip]

singular is more suited to
change to "check out"
e-mail => email, and subject/verb agreement
add punctuation
Remove duplicate configuration option for ActiveSupport [ci skip]

Fixes rails/rails#13732
`requies` => `requires`
`easiy` => `easy`
`framwork` => `framework`
Remove old comments about suppressing warnings.
Fixed spelling error: `extracetd` => `extracted`
Rely on backticks instead of tt tags [ci skip]

Since the language in code blocks is inferred, if the code contains tt
tags, the block will be parsed as XML for instance while it is Ruby.
context in validation goes through has many relationship
Updated the cookie docs to use the safer JSON.{generate,parse}

cc @senny
Add test case for autosave HasMany with accepts_nested_attributes.

It should not save the parent record when the nested attributes are
invalid.

Test case to cover #8194.
Merge pull request #13974 from laurocaetano/test_case_for_autosave_with_accepts_nested_attributes

Add test case for autosave association with nested attributes.
Fixed an issue where reloading of removed dependencies would cause an unexpected circular dependency error
Skips tests on Windows that create files with illegal characters
Merge pull request #13977 from Octember/master

Fixed an issue where reloading of removed dependencies would cause an un...
Merge pull request #13979 from mellowi/windows_disallowed_static_files_skipped

Skips tests on Windows that create files with illegal characters
Skips linked folder tests if symlink is invalid