t.register manual: add link to r.timestamp

temporal/t.register/t.register.html

@@ -297,6 +297,7 @@ t.register -i type=raster input=temperature_mean_1950_2015_daily \
 <h2>SEE ALSO</h2>
 
 <em>
+<a href="r.timestamp.html">r.timestamp</a>,
 <a href="t.create.html">t.create</a>,
 <a href="t.info.html">t.info</a>
 </em>