Fix capture_helper.rb api documentation, unescaped script tag was breaking it on the content_for explanation

This reverts commit 7a6d8e4a.

Reason: The method that gives you a Ruby string with JSON source code is #to_json

Signed-off-by: NXavier Noria <fxn@hashref.com>

This information was lost in commit bd6b61be.
This might have been intentional, but this class does represent the starting
point for all things related to actions, and as such should document it.

I couldn't find any trace of this documentation, which seems like a waste.
Updated parts here and there to conform to current best practices.

Signed-off-by: NXavier Noria <fxn@hashref.com>

Conflicts:

	activerecord/lib/active_record/relation/query_methods.rb

now the reported line is the first line in the stack
that's outside Rails, which is the one that actually
caused the problem in the first place

[#5231 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NXavier Noria <fxn@hashref.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

If you were using symbols before for methods like match/get/post/put/delete, it is likely that this commit will break your routes.
Everything should behave the same if you are using strings, if not, please open up a ticket.

This reverts commit 02aabbd1.

This rake version adds the Rake::RDocTask#rdoc_task_name method, used in
railties/lib/rails/tasks/documentation.rake
Signed-off-by: NJosé Valim <jose.valim@gmail.com>