help: new SHA-1 fingerprint of hg.intevation.org in hostfingerprints example

The certificate was updated in March 2012.
You can verify the certificate by using the Root CA certificate downloadable
from https://ssl.intevation.de/
The intermediate CA is sent by https://hg.intevation.org/

mercurial/help/config.txt

@@ -745,7 +745,7 b' The CA chain and web.cacerts is not used'
 For example::
 
     [hostfingerprints]
-    hg.intevation.org = 38:76:52:7c:87:26:9a:8f:4a:f8:d3:de:08:45:3b:ea:d6:4b:ee:cc
+    hg.intevation.org = 44:ed:af:1f:97:11:b6:01:7a:48:45:fc:10:3c:b7:f9:d4:89:2a:9d
 
 This feature is only supported when using Python 2.6 or later.