Add missing details to documentation regarding automated index updates

The page at:

http://www.couchbase.com/docs/couchbase-manual-2.0/couchbase-views-operation-autoupdate.html

Misses some important details:

• if updateMinChanges is set to 0 (zero), then automatic updates are disabled for main indexes;
• if replicaUpdateMinChanges is set to 0 (zero), then automatic updates are disabled for replica indexes;
• the updateMinChanges and replicaUpdateMinChanges can have a per ddoc granularity (by defining them in the ddocs' body)

See:

http://hub.internal.couchbase.com/confluence/display/QA/Debugging+view+engine+issues+and+reporting+them?focusedCommentId=5931509&#Debuggingviewengineissuesandreportingthem-section13

Also, minor detail, the page shows invalid JSON:

{ "updateInterval":5000, "updateMinChanges":5000, "replicaUpdateMinChanges":5000, }

The last field shouldn't have a comma following its value.

Another detail is that the text mention that a POST is used to configure the settings, but the blue box exemplifying it shows a GET.