libtiff: doc: Add missing punctuation

From ad886e10c57a2c6f03a8923b3c5a6d9d994382db Mon Sep 17 00:00:00 2001
From: Roger Leigh <[EMAIL REDACTED]>
Date: Sun, 19 Jun 2022 08:36:19 +0100
Subject: [PATCH] doc: Add missing punctuation

 doc/internals.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/internals.rst b/doc/internals.rst
index cb094b2f..21b60417 100644
--- a/doc/internals.rst
+++ b/doc/internals.rst
@@ -384,7 +384,7 @@ or do the following to add support directly to the core library:
 * Create a file with the compression scheme code, by convention files
   are named :file:`tif_*.c` (except perhaps on some systems where the
   ``tif_`` prefix pushes some filenames over 14 chars.
-* Update build configuration to include new source file
+* Update build configuration to include new source file.
 A codec, say ``foo``, can have many different entry points: