RFR: Removing a JBS Issue [v4]

[Jesper Wilhelmsson]

> Short note on removing JBS issues.
> And adding back a lost parenthesis.
> Added text about understanding the code before creating a PR.

Jesper Wilhelmsson has updated the pull request incrementally with two additional commits since the last revision:

 - Fixes after review
 - Update src/guide/working-with-pull-requests.md
   
   Co-authored-by: Alexey Ivanov <alexey.ivanov at oracle.com>

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

Changes:
  - all: https://git.openjdk.org/guide/pull/112/files
  - new: https://git.openjdk.org/guide/pull/112/files/83d15aa4..d7ac052f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=112&range=03
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=112&range=02-03

  Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/guide/pull/112.diff
  Fetch: git fetch https://git.openjdk.org/guide.git pull/112/head:pull/112

PR: https://git.openjdk.org/guide/pull/112