Merge remote-tracking branch 'origin/doc/11234-explain-check-mirrors'

Fix-committed: #11234

wiki/src/contribute/release_process.mdwn

@@ -732,7 +732,9 @@ Test downloading the ISO and IUK over HTTP.
 
 Make sure every webserver listed in the `dl.amnesia.boum.org` round
 robin pool has the new version. Drop those that are lagging behind and
-notify their administrators.
+notify their administrators:
+
+	./check-mirrors.rb --allow-multiple --fast tails-i386-$VERSION
 
 ISO history
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