docs/submittingpatches: fix tags mis/abuse

Fix the odd tag so that we're HTML 4.01 Traditional compliant

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

docs/submittingpatches.html

@@ -134,7 +134,7 @@ to check for regressions.
 <p>
 Patches should be sent to the mesa-dev mailing list for review:
 <a href="https://lists.freedesktop.org/mailman/listinfo/mesa-dev">
-mesa-dev@lists.freedesktop.org<a/>.
+mesa-dev@lists.freedesktop.org</a>.
 When submitting a patch make sure to use
 <a href="https://git-scm.com/docs/git-send-email">git send-email</a>
 rather than attaching patches to emails. Sending patches as
@@ -161,6 +161,7 @@ state of your old patches to Superseded.
 <p>
 When you've reviewed a patch on the mailing list, please be unambiguous
 about your review.  That is, state either
+</p>
 <pre>
     Reviewed-by: Joe Hacker &lt;jhacker@foo.com&gt;
 </pre>
@@ -168,14 +169,17 @@ or
 <pre>
     Acked-by: Joe Hacker &lt;jhacker@foo.com&gt;
 </pre>
+<p>
 Rather than saying just "LGTM" or "Seems OK".
 </p>
 
 <p>
 If small changes are suggested, it's OK to say something like:
+</p>
 <pre>
    With the above fixes, Reviewed-by: Joe Hacker &lt;jhacker@foo.com&gt;
 </pre>
+<p>
 which tells the patch author that the patch can be committed, as long
 as the issues are resolved first.
 </p>