minor #16597 Add quotations marks (maciejkosiarski)

This PR was submitted for the 6.0 branch but it was merged into the 4.4 branch instead.

Discussion
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Add quotations marks

Add quotations marks in generates getter/setter methods for one specific Entity example, current example command return "[ERROR] No entities were found in the "AppEntityAdwordsCountry" namespace."

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Commits
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3a9f28a Add quotations marks

Author: javiereguiluz

doctrine/reverse_engineering.rst

@@ -103,7 +103,7 @@ run:
     $ php bin/console make:entity --regenerate App
 
     // generates getter/setter methods for one specific Entity
-    $ php bin/console make:entity --regenerate App\Entity\Country
+    $ php bin/console make:entity --regenerate "App\Entity\Country"
 
 .. note::