Cleanup more @return annotations

Author: nicolas-grekas

Compiler.php

@@ -36,7 +36,7 @@ public function getFunction(string $name)
     /**
      * Gets the current PHP code after compilation.
      *
-     * @return string The PHP code
+     * @return string
      */
     public function getSource()
     {

Expression.php

@@ -28,7 +28,7 @@ public function __construct(string $expression)
     /**
      * Gets the expression.
      *
-     * @return string The expression
+     * @return string
      */
     public function __toString()
     {

ExpressionLanguage.php

@@ -48,7 +48,7 @@ public function __construct(CacheItemPoolInterface $cache = null, array $provide
      *
      * @param Expression|string $expression The expression to compile
      *
-     * @return string The compiled PHP source code
+     * @return string
      */
     public function compile($expression, array $names = [])
     {
@@ -60,7 +60,7 @@ public function compile($expression, array $names = [])
      *
      * @param Expression|string $expression The expression to compile
      *
-     * @return mixed The result of the evaluation of the expression
+     * @return mixed
      */
     public function evaluate($expression, array $values = [])
     {

Parser.php

@@ -86,7 +86,7 @@ public function __construct(array $functions)
      * variable 'container' can be used in the expression
      * but the compiled code will use 'this'.
      *
-     * @return Node\Node A node tree
+     * @return Node\Node
      *
      * @throws SyntaxError
      */

Token.php

@@ -44,7 +44,7 @@ public function __construct(string $type, $value, ?int $cursor)
     /**
      * Returns a string representation of the token.
      *
-     * @return string A string representation of the token
+     * @return string
      */
     public function __toString()
     {