minor #4077 Removed outdated translations from the official list (WouterJ)

This PR was merged into the 2.3 branch.

Discussion
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Removed outdated translations from the official list

Looking at the activity of these 2 translations, I think it's safe to say that they aren't up to date with the documentation.

@chrisbujok and @gitnacho please tell me if this isn't true. I have a hard time understanding your issues and commit messages to really tell if this is true.

| Q   | A
| --- | ---
| Doc fix? | yes
| New docs? | no
| Applies to | all
| Fixed tickets | -

/cc @fabpot

Commits
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c56167f Removed outdated translations from the official list

Author: weaverryan

contributing/documentation/translations.rst

@@ -20,9 +20,7 @@ for. Here is the list of the official *master* repositories:
 * *French*:   https://github.com/symfony-fr/symfony-docs-fr
 * *Italian*:  https://github.com/garak/symfony-docs-it
 * *Japanese*: https://github.com/symfony-japan/symfony-docs-ja
-* *Polish*:   https://github.com/symfony-docs-pl/symfony-docs-pl
 * *Portuguese (Brazilian)*:  https://github.com/andreia/symfony-docs-pt-BR
-* *Spanish*:  https://github.com/gitnacho/symfony-docs-es
 
 .. note::