Docs: update "nullable_type" comments to clarify meaning

Author: jrfnl

src/Files/File.php

@@ -1288,7 +1288,8 @@ public function getDeclarationName($stackPtr)
      *                                           // or FALSE if there is no type hint.
      *         'type_hint_end_token' => integer, // The stack pointer to the end of the type hint
      *                                           // or FALSE if there is no type hint.
-     *         'nullable_type'       => boolean, // TRUE if the var type is nullable.
+     *         'nullable_type'       => boolean, // TRUE if the type is preceded by the nullability
+     *                                           // operator.
      *         'comma_token'         => integer, // The stack pointer to the comma after the param
      *                                           // or FALSE if this is the last param.
      *        )
@@ -1536,7 +1537,8 @@ public function getMethodParameters($stackPtr)
      *    'return_type'          => '',       // The return type of the method.
      *    'return_type_token'    => integer,  // The stack pointer to the start of the return type
      *                                        // or FALSE if there is no return type.
-     *    'nullable_return_type' => false,    // TRUE if the return type is nullable.
+     *    'nullable_return_type' => false,    // TRUE if the return type is preceded by the
+     *                                        // nullability operator.
      *    'is_abstract'          => false,    // TRUE if the abstract keyword was found.
      *    'is_final'             => false,    // TRUE if the final keyword was found.
      *    'is_static'            => false,    // TRUE if the static keyword was found.
@@ -1706,7 +1708,8 @@ public function getMethodProperties($stackPtr)
      *                                  // or FALSE if there is no type.
      *    'type_end_token'  => integer, // The stack pointer to the end of the type
      *                                  // or FALSE if there is no type.
-     *    'nullable_type'   => boolean, // TRUE if the type is nullable.
+     *    'nullable_type'   => boolean, // TRUE if the type is preceded by the nullability
+     *                                  // operator.
      *   );
      * </code>
      *