Merge pull request #237 from stollr/fix_deprecattions

Fixed some deprecation messages

Author: zbateson

src/Container.php

@@ -92,6 +92,8 @@ public function offsetExists($id) : bool
      *
      * @param string | int $id
      *
+     * @return mixed The value of the parameter or an object
+     *
      * @throws UnknownIdentifierException
      */
     #[\ReturnTypeWillChange]

src/Message/PartChildrenContainer.php

@@ -128,6 +128,9 @@ public function offsetExists($offset) : bool
         return isset($this->children[$offset]);
     }
 
+    /**
+     * @return mixed
+     */
     #[\ReturnTypeWillChange]
     public function offsetGet($offset)
     {