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Inconsistent capitalization.
The Chapter 1 intro capitalizes all four words. I would pick one convention and stick with it.

This is also my first time seeing the term "High Availability Service Management," capitalized or not. Is this a new proper noun for RHEL 8? Just curious.

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8-beta/html/configuring_and_managing_high_availability_clusters/assembly_overview-of-high-availability-configuring-and-managing-high-availability-clusters#annotations:6b35edbe-4604-41ed-9cc7-31e0d3451f12

Other questionable instances in the same section (1.1):
- "Cluster infrastructure" vs. "Cluster Infrastructure"
- "the high availability and Service Management components" vs. case-insensitive "the High Availability Service Management components"

High Availability Add-On is the product name, as was determined at RHEL 6 I think.  I'll check to be sure all four words are consistently capitalized.

The other phrases come from the RHEL 7 overview, which I did not originally write (I just chipped in way down since it had a lot of redundant stuff).  I don't like the random capitalization either so I'll make these instances lower case.

Checking through this, the only all-initial-caps occurences for "High Availability" are when this is used as the actual name for the High Availability Add-On product.

The main update is here:

https://doc-stage.usersys.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_high_availability_clusters/#s1-rhcs-intro-HAAO