CCBC-531: Document 64 bit counter on server
CCBC-531: Document 64 bit counter on server

Change-Id: I0739573a197223d680774332840a457548638640
Reviewed-on: http://review.couchbase.org/42444
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Tested-by: Mark Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>

signmotion/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,mody/libcouchbase,mnunberg/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,mnunberg/libcouchbase,couchbase/libcouchbase,maxim-ky/libcouchbase,senthilkumaranb/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase,senthilkumaranb/libcouchbase,avsej/libcouchbase,senthilkumaranb/libcouchbase,PureSwift/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase,maxim-ky/libcouchbase,mnunberg/libcouchbase,PureSwift/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,PureSwift/libcouchbase,PureSwift/libcouchbase,signmotion/libcouchbase,mody/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,mnunberg/libcouchbase,maxim-ky/libcouchbase,signmotion/libcouchbase,signmotion/libcouchbase,mnunberg/libcouchbase,senthilkumaranb/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,avsej/libcouchbase,mody/libcouchbase