Update book/forms.rst

Fix typo (missing ";") in source code sample for dynamic validation groups
Update form_collections.rst

The assignment to collectionHolder must be done within jQuery ready function, or else it will be null.
BTW, the variables in JavaScript do not need the $, which is confusing since in jQuery $ has a special meaning.
Fix all lowercase "url" notations to uppercase "URL"
[Reference][Configuration options] Implement consistent headings
Merge pull request #3167 from bicpi/fix_url_notations

Fix all lowercase "url" notations to uppercase "URL"
[Security] fixed a dot in a regex
Fixed typo

Was:
> This option determines if the form will inherit data fotm its parent form.

Changed to:
> This option determines if the form will inherit data from its parent form.
Merge branch '2.2' of https://github.com/symfony/symfony-docs into 2.2
Collection of fixes: typos, formatting, logic, links
Another collection of fixes: Typos, logic, formatting etc.
updated rexeg
Merge pull request #3169 from bamarni/patch-5

[Security] fixed a dot in a regex
added the example Twig Code for the HTML5 no novalidate attribute

in the form documentation, there is a notice about the no validate HTML5 attribute, but without the twig example.

I added the twig code
Fix white spaces in the previous commit
Added the PHP no validate example

tested on symfony 2.3
added PHP file comment
added configuration block

I added no semicolon at the end of the PHP echo because in all other examples there exists no semicolon
[#3170] Tabbing out the code example so it's in the sidebar
Merge pull request #3171 from zenobius/patch-1

Fixed typo
Update form_collections.rst

The variable collectionHolder must be assigned inside the jQuery ready function, but must be declared outside, since it is used also in other functions.

I have put back the '$' in front of names of variables having jQuery objects as values and for uniformity, also added it to collectionHolder.