minor #39534 Normalize exceptions messages containing methods references (ogizanagi)

This PR was merged into the 4.4 branch.

Discussion
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Normalize exceptions messages containing methods references

| Q             | A
| ------------- | ---
| Branch?       | 4.4 <!-- see below -->
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix symfony/symfony#39399 (comment) <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT
| Doc PR        | N/A

Normalizes across the codebase any exception message mentioning methods to contain a trailing `()`

(Seems OK on 5.1 and 5.2 branch after this on is merged up)

Commits
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e2da2acd6d Normalize exceptions messages containing methods references

Author: fabpot

Mapping/Loader/AnnotationLoader.php

@@ -77,7 +77,7 @@ public function loadClassMetadata(ClassMetadata $metadata)
                         if (preg_match('/^(get|is|has)(.+)$/i', $method->name, $matches)) {
                             $metadata->addGetterMethodConstraint(lcfirst($matches[2]), $matches[0], $constraint);
                         } else {
-                            throw new MappingException(sprintf('The constraint on "%s::%s" cannot be added. Constraints can only be added on methods beginning with "get", "is" or "has".', $className, $method->name));
+                            throw new MappingException(sprintf('The constraint on "%s::%s()" cannot be added. Constraints can only be added on methods beginning with "get", "is" or "has".', $className, $method->name));
                         }
                     }