rsync fixes

[sspencerwire]

• fix wording issue "a ssh key pair" to "an ssh key pair"
• remove unneccessary "the" in one line
• fix incorrect inclusion of "a" in the line "there are a many" to read
  "there are many"
• put the -a option in back ticks (a)
• changed "In this case we assume" line to an "attention" admonition
• removed "go next" from the line "go next go ahead"
• removed specific reference to Rocky Linux in the automation section
• removed the "update:" meta and replaced it with the "tags:" meta and
  tags

Author checklist (Completed by original Author)

• Contribution a good fit for the Rocky project? Title and Author MetaTags inserted ?
• Is this a non-English contribution?
• If applicable, steps and instructions have been tested to work on a real system
• Did you perform an initial self-review to fix basic typos and grammatical correctness

Rocky Documentation checklist (Completed by Rocky team)

• 1st Pass (Check that document is good fit for project and author checklist completed)
• 2nd Pass (Technical Review - check for technical correctness)
• 3rd Pass (Basic Editorial Review)
• 4th Pass (Detailed Editorial Review and Peer Review)
• Final pass/approval (Final Review)