man: fix copy-and-paste error

Follow-up for 85a1360.

(cherry picked from commit 4d9cac5)
(cherry picked from commit 9c7d9ad0ea2c8c81f50d68f6e4ece5a182d63fbf)

Author: yuwata

man/version-info.xml

@@ -79,7 +79,7 @@
   <para id="v255">Added in version 255.</para>
   <para id="v256">Added in version 256.</para>
   <para id="v257">Added in version 257.</para>
-  <para id="v257">Added in version 258.</para>
-  <para id="v257">Added in version 259.</para>
-  <para id="v257">Added in version 260.</para>
+  <para id="v258">Added in version 258.</para>
+  <para id="v259">Added in version 259.</para>
+  <para id="v260">Added in version 260.</para>
 </refsect1>