minor #10528 Update OptionsResolver.php (shadypierre)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes #10528).

Discussion
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Update OptionsResolver.php

Deleting an extra space in the exception.

Commits
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7507fbb Update OptionsResolver.php

src/Symfony/Component/OptionsResolver/OptionsResolver.php

@@ -276,7 +276,7 @@ class OptionsResolver implements OptionsResolverInterface
             ksort($diff);
 
             throw new MissingOptionsException(sprintf(
-                count($diff) > 1 ? 'The required options "%s" are missing.' : 'The required option "%s" is  missing.',
+                count($diff) > 1 ? 'The required options "%s" are missing.' : 'The required option "%s" is missing.',
                 implode('", "', array_keys($diff))
             ));
         }