squash: fix typo

Author: LiviaMedeiros

doc/api/fs.md

@@ -415,7 +415,7 @@ changes:
   * `position` {integer|bigint|null} The location where to begin reading data
     from the file. If `null` or `-1`, data will be read from the current file
     position, and the position will be updated. If `position` is a non-negative
-    integer,the current file position will remain unchanged.
+    integer, the current file position will remain unchanged.
     **Default:**: `null`
 * Returns: {Promise} Fulfills upon success with an object with two properties:
   * `bytesRead` {integer} The number of bytes read