RFR: 1463: Include starting branch in back port instructions [v4]

[Guoxiong Li]

> Hi all,
> 
> This patch adds the suggested git command about fetching the newest code 
> from the target branch before solving the conflicts.
> 
> Thanks for taking the time to review.
> 
> Best Regards,
> -- Guoxiong

Guoxiong Li has updated the pull request incrementally with two additional commits since the last revision:

 - Add more comments to state the commands
 - Fix test cases.

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1344/files
  - new: https://git.openjdk.org/skara/pull/1344/files/44335603..5932229a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1344&range=03
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1344&range=02-03

  Stats: 14 lines in 3 files changed: 10 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/skara/pull/1344.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1344/head:pull/1344

PR: https://git.openjdk.org/skara/pull/1344