patches.html: It's no longer necessary to include the man-pages version in a patch commit message

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
diff --git a/patches.html b/patches.html
index 52e68c3..0496af2 100644
--- a/patches.html
+++ b/patches.html
@@ -252,15 +252,6 @@
     </li>
     
     <li>
-      In the body of the mail message,
-      <strong>identify the
-      <em>man-pages</em>
-      version</strong> against which the patch applies.
-      <br>
-      <br>
-    </li>
-    
-    <li>
       <strong>Send patches in
       <span class="cmd">diff -u</span>
       format</strong>; inline inside the mail message