Fix typo in grammar/README.md

Author: ntzm

grammar/README.md

@@ -1,12 +1,12 @@
 What do all those files mean?
 =============================
 
- * `php5.y`:            PHP 5 grammar written in a pseudo language
- * `php7.y`:            PHP 7 grammar written in a pseudo language
- * `tokens.y`:          Tokens definition shared between PHP 5 and PHP 7 grammars
- * `parser.template`:   A `kmyacc` parser prototype file for PHP
- * `tokens.template`:   A `kmyacc` prototype file for the `Tokens` class
- * `rebuildParser.php`: Preprocesses the grammar and builds the parser using `kmyacc`
+ * `php5.y`:             PHP 5 grammar written in a pseudo language
+ * `php7.y`:             PHP 7 grammar written in a pseudo language
+ * `tokens.y`:           Tokens definition shared between PHP 5 and PHP 7 grammars
+ * `parser.template`:    A `kmyacc` parser prototype file for PHP
+ * `tokens.template`:    A `kmyacc` prototype file for the `Tokens` class
+ * `rebuildParsers.php`: Preprocesses the grammar and builds the parser using `kmyacc`
 
 .phpy pseudo language
 =====================
@@ -16,13 +16,13 @@ applied to it:
 
  * Nodes are created using the syntax `Name[..., ...]`. This is transformed into
    `new Name(..., ..., attributes())`
- * Some function-like constructs are resolved (see `rebuildParser.php` for a list)
+ * Some function-like constructs are resolved (see `rebuildParsers.php` for a list)
 
 Building the parser
 ===================
 
 In order to rebuild the parser, you need [moriyoshi's fork of kmyacc](https://github.com/moriyoshi/kmyacc-forked).
-After you compiled/installed it, run the `rebuildParser.php` script.
+After you compiled/installed it, run the `rebuildParsers.php` script.
 
 By default only the `Parser.php` is built. If you want to additionally emit debug symbols and create `y.output`, run the
 script with `--debug`. If you want to retain the preprocessed grammar pass `--keep-tmp-grammar`.