Merge pull request #417 from FreifunkMD/doc

doc: remove "probability" from site doc (was removed in v2014.3)

docs/user/site.rst

@@ -149,7 +149,6 @@ autoupdater : package
               'http://[fdca:ffee:babe:1::fec1]/firmware/stable/sysupgrade/',
               'http://[fdca:ffee:babe:1::fec2]/firmware/stable/sysupgrade/',
             },
-            probability = 0.08,
             good_signatures = 2,
             pubkeys = {
               'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX', -- someguy