Improve document: working with javascript in rails [ci skip].
* Add form_tag generated output.
* improve some text.
* data-remote='true' should use double quotes.
Merge pull request #13316 from JuanitoFatas/working-with-js

Improve document: working with javascript in rails [ci skip].
Fix syntax error in redirect_to example

Without parenthesis, ruby assumes that curly braces denote the beginning
of a block.
Merge pull request #13324 from fphilipe/fix-syntax-error-in-example

Fix syntax error in redirect_to example
Improved documents [ci skip]
Merge pull request #13325 from kuldeepaggarwal/docs-update

Improved documents [ci skip]