[MacPorts] #59889: Update uninstall directions, Catalina and SIP-protections

[MacPorts]

#59889: Update uninstall directions, Catalina and SIP-protections
--------------------+--------------------
 Reporter:  nwg     |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  guide   |    Version:
 Keywords:          |       Port:
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 Even as root, you get various "operation not permitted" errors when
 following the uninstall directions for catalina here:
 [https://guide.macports.org/chunked/installing.macports.uninstalling.html].

 {{{
 rm: /opt/local//var/macports/home/Library/Preferences: Operation not
 permitted
 }}}

 The problem is SIP permissions:
 [https://apple.stackexchange.com/questions/342090/sip-preventing-deletion-
 of-opt-local]

 The solution is to simply move the deletion of macports users before the
 deletion of the directories.

-- 
Ticket URL: <https://trac.macports.org/ticket/59889>
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