[Bug 264763] Remove references to portsnap

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264763

            Bug ID: 264763
           Summary: Remove references to portsnap
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Books & Articles
          Assignee: doc@FreeBSD.org
          Reporter: bofh@freebsd.org

Created attachment 234778
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=234778&action=edit
Remove portsnap

Although we are still generating portsnap deltas it is no longer the
recommended methods and git should be promoted. So remove references to
portsnap. Additionally

- Remove training whitespace
- Remove trailing consecutive blank lines

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