Merge branch 'russell/remove-mention-of-ha' into 'master'

Remove mention of HA from the Praefect docs

See merge request gitlab-org/gitlab!32228

doc/administration/gitaly/praefect.md

@@ -55,8 +55,8 @@ for improvements including
 
 The minimum recommended configuration for a Gitaly Cluster requires:
 
-- 1 highly available load balancer
-- 1 highly available PostgreSQL server (PostgreSQL 11 or newer)
+- 1 load balancer
+- 1 PostgreSQL server (PostgreSQL 11 or newer)
 - 3 Praefect nodes
 - 3 Gitaly nodes (1 primary, 2 secondary)