Describe the issue: While the installation guides is clear about the minimum of three nodes for production use, it's note explicitly documented that for multi-site clusters, an odd number of sites are required.

Describe the task you were trying to accomplish:

Suggestions for improvement: Add the sentence below to the "Important" note in 1.2 :
"For quorum reasons, multi-site clusters with synchronous replication require an odd number of sites (min. of three) to survive a site failure without manual intervention."

Document URL: https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.5/html-single/installation_guide/index#sect-Prerequisites1 

Chapter/Section Number and Title: 1.2. Prerequisites

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