merged branch ragtek/master (PR symfony#6121)

This PR was merged into the master branch. Commits ------- 1db6f05 Update UPGRADE-2.2.md Discussion ---------- Removed duplicate words in the "validator changes" description in file UPGRADE-2.2.md

Author: fabpot

UPGRADE-2.2.md

@@ -38,7 +38,7 @@
 
 ### Validator
 
- * Interfaces were created for created for the classes `ConstraintViolation`,
+ * Interfaces were created for the classes `ConstraintViolation`,
  `ConstraintViolationList`, `GlobalExecutionContext` and `ExecutionContext`.
  If you type hinted against any of these classes, you are recommended to
  type hint against their interfaces now.