BLENDER: Show warning for target branch switching

Author: brechtvl

templates/repo/issue/view_title.tmpl

@@ -105,6 +105,7 @@
 								</div>
 							</div>
 						</div>
+						<div class="desc"><br/>When changing the target branch, be careful to rebase the branch in your fork to match. See <a href="https://wiki.blender.org/wiki/Tools/Pull_Requests">documentation</a>.</div>
 					</span>
 				{{end}}
 			{{else}}