Cluster formula - Global description update

[jniedergang]

Hello,

I feel like we could be giving more info about what this formula is doing in the global description.
Current:
Salt formula to bootstrap and manage a pacemaker high availability cluster.

Suggested:
Salt formula to bootstrap and manage a pacemaker high availability cluster.
It is recommended to use this formula from a SUSE Manager "System Groups" where all the future cluster nodes have been added.
Storage related notes:
For specific storage shared device like Stonith Block Device (SBD - Cluster internal communication using the storage) or OCFS2 (shared disk file system), you need to present the storage to each of your nodes prior to run the formula.
Network related notes:
You will be asked for the interface to be used for the cluster internal communications.
Please note that we usually divide the cluster internal communications and the applications communications (resources held by the cluster).
Setup your nodes accordingly to meet your segmentation and availability design (the more communication paths you have, the less split-brain case you will meet).