git: Correct gitignore reasoning, empty not untracked

Signed-off-by: Mark Grant <[email protected]>

Author: m-grant-prg

m4/.gitignore

@@ -1,6 +1,6 @@
 #########################################################################
 #									#
-# Author: Copyright (C) 2023  Mark Grant				#
+# Author: Copyright (C) 2023, 2024  Mark Grant				#
 #									#
 # Released under the GPLv3 only.					#
 # SPDX-License-Identifier: GPL-3.0-only					#
@@ -13,8 +13,7 @@
 #########################################################################
 
 # This .gitignore file is to ensure that this directory exists even though
-# none of it's contents will ever be tracked. This is required because
-# otherwise, after cloning, the project build will fail citing this missing
-# directory.
+# empty. This is required because otherwise, after cloning, the project build
+# will fail citing this missing directory.
 # In other words, this is a git hack to satisfy AutoTools.