Added some missing labels in configuration blocks

[javiereguiluz]

In addition to the main fix, I made another change in this PR.

The current labels for "php-symfony" and "php-standalone" are "Framework Use" and "Standalone Use". I don't think they are bad, but they could be better.

In this PR I propose to use "Symfony apps" and "Standalone PHP apps". Here's a comparison:

I like "Symfony apps" a lot but I don't like "Standalone PHP apps" the same. Maybe "Other PHP apps", "Non-Symfony apps", ... ? Or maybe the original labels are better and we should keep them?

What do you think @weaverryan, @wouterj? Thanks!

[OskarStark]

With Framework or With the Framework

Without Framework or Without the Framework ?

Or Framework / No Framework?

[javiereguiluz]

Please, don't forget to add your suggestions here. Thanks!

[javiereguiluz]

I've reverted the proposed label renames to make this mergeable and we can discuss about renaming in the future.