Ref #3903 - Normalize methods listings
minor #4550 Ref #3903 - Normalize methods listings (ternel)

This PR was squashed before being merged into the 2.3 branch (closes #4550).

Discussion
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Ref #3903 - Normalize methods listings

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3+
| Fixed tickets | #3903

I only did this on methods listings which have some informations about the methods. (ie. I didn't change anything on this page: http://symfony.com/doc/current/contributing/code/conventions.html#method-names)

Commits
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9039e5b Ref #3903 - Normalize methods listings