[perl #88812] INSTALL file podification, other changes (post-5.14)

# New Ticket Created by  "Kevin J. Woolley" 
# Please include the string:  [perl #88812]
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- minor spelling, punctuation corrections
- much podification
- p/Perl consistency (accuracy of this is disputed)

Definitely review before applying, especially with regards to the third point.

• [perl #88812] INSTALL file podification, other changes (post-5.14) by Kevin J. Woolley
• RE: [perl #88812] INSTALL file podification, other changes(post-5.14) by Konovalov, Vadim ** CTR **
• Re: [perl #88812] INSTALL file podification, other changes (post-5.14) by Offer Kaye
• RE: [perl #88812] INSTALL file podification, other changes(post-5.14) by Konovalov, Vadim ** CTR **