minor #20340 [Translation] Fix param name for lint:translations (MrYamous)

This PR was merged into the 7.2 branch.

Discussion
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[Translation] Fix param name for lint:translations

For code [PR 57650](symfony/symfony#57650)

Commits
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ef9baef fix param name for lint:translations

Author: javiereguiluz

translation.rst

@@ -1405,7 +1405,7 @@ to check that the translation contents are also correct:
         $ php bin/console lint:translations
 
         # checks the contents of the translation catalogues for Italian (it) and Japanese (ja) locales
-        $ php bin/console lint:translations --locales=it --locales=ja
+        $ php bin/console lint:translations --locale=it --locale=ja
 
 .. versionadded:: 7.2