doc: fix brackets position

PR-URL: nodejs#42649
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

doc/api/fs.md

@@ -3213,7 +3213,7 @@ number of bytes read is zero.
 If this method is invoked as its [`util.promisify()`][]ed version, it returns
 a promise for an `Object` with `bytesRead` and `buffer` properties.
 
-### `fs.read(fd, [options,] callback)`
+### `fs.read(fd[, options], callback)`
 
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