git: build.7: document more "upgrade" target details

[Daniel Fojt]

commit 46af47d07e9f2a39329ed1586c1df6592942d998
Author: Daniel Fojt <df at neosystem.org>
Date:   Fri Jul 31 08:14:37 2020 +0200

    build.7: document more "upgrade" target details
    
    Mention "deprecated" objects and describe how to safely remove them from
    newly upgraded system.

Summary of changes:
 share/man/man7/build.7 | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/46af47d07e9f2a39329ed1586c1df6592942d998


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