docs: fix html bug

</space> doesn't exist.  Introduced in commit 4bb4109f.

* docs/formatdomain.html.in: Use correct end tag.

docs/formatdomain.html.in

@@ -1015,7 +1015,7 @@
             There is also an
             optional <code>rerror_policy</code> that controls behavior
             for read errors only. <span class="since">Since
-            0.9.7</space>. If no rerror_policy is given, error_policy
+            0.9.7</span>. If no rerror_policy is given, error_policy
             is used for both read and write errors. If rerror_policy
             is given, it overrides the <code>error_policy</code> for
             read errors. Also note that "enospace" is not a valid