Fold formal_parameters

Author: Ben3eeE

grammars/tree-sitter-php.cson

@@ -28,6 +28,11 @@ folds: [
     start: {type: '{'},
     end: {type: '}'}
   }
+  {
+    type: 'formal_parameters'
+    start: {type: '('}
+    end: {type: ')'}
+  }
   {
     start: {type: '(', index: 0},
     end: {')', index: -1}