doc: fix wording in fs.appendFile

rudolf · Fishrock123 · commit 15d156e3ecd6 · 2015-02-11T10:42:25.000-05:00
PR-URL: nodejs#801 Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
diff --git a/doc/api/fs.markdown b/doc/api/fs.markdown
@@ -517,7 +517,7 @@ The synchronous version of `fs.writeFile`.
   * `flag` {String} default = `'a'`
 * `callback` {Function}
 
-Asynchronously append data to a file, creating the file if it not yet exists.
+Asynchronously append data to a file, creating the file if it does not yet exist.
 `data` can be a string or a buffer.
 
 Example:
