RFR: Note on Affected version [v3]

[Jesper Wilhelmsson]

> Added a note on when to use the affected version field and did some other minor cleanups.
> Also added some guidance around when to back out a change.

Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:

  Clarifications around backing out

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

Changes:
  - all: https://git.openjdk.org/guide/pull/140/files
  - new: https://git.openjdk.org/guide/pull/140/files/94cb7c45..69c17972

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=140&range=02
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=140&range=01-02

  Stats: 6 lines in 1 file changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/guide/pull/140.diff
  Fetch: git fetch https://git.openjdk.org/guide.git pull/140/head:pull/140

PR: https://git.openjdk.org/guide/pull/140