[2.2] Updated most routing changes

| Q              | A
| -------------- | ---
| Doc fix?       | yes (symfony/symfony#6738, symfony/symfony#6022, symfony/symfony#6825)
| New docs?      | no
| Applies to     | 2.2+
| Closes tickets | #2163

The Routing component has renamed some important options. This PR is fixes the most occurences of wrong Routing options in the documentation, I can't promise that every occurence is now fixed.

I marked this as a WIP because the `hostname` option is likely to be renamed to `host`, when that PR is created + merged I will change them and this PR can get merged.