gplugin/gplugin

Remove some documentation about hgflow from HACKING.md as we don't use hgflow anymore

2021-03-22, Gary Kramlich
11c702036a0a
Remove some documentation about hgflow from HACKING.md as we don't use hgflow anymore

Testing Done:
Eye testing only.

Reviewed at https://reviews.imfreedom.org/r/579/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "gplugin/gplugin"
REPOSITORY_TYPE = "mercurial"
BRANCH = "default"
LAND_DEST_BRANCH = "default"
LAND_PUSH = False