[Symfony CLI] Move "different TLD" block above

[Kocal]

While reading the documentation, I find it weird that the blocks about symfony proxy:url and https_proxy env var were
between the two code blocks about defining a local domain and changing the TLD.

[Kocal]

On another note, I find it weird that the the Symfony CLI documentation is coupled with Symfony versions:

[javiereguiluz]

I love this attention to detail 😍 Thanks Hugo!

You are right about versioning this page. However, we can't unversion some specific pages in the docs, so all of them have to be versionned. In practice, we take care of always merging docs about the Symfony CLI in the lowest maintained branch.

[Kocal]

Fine, thanks Javier :)