RFR: Updates to the JBS section of the OpenJDK Dev Guide [v5]

[calnan]

> Added overview on triaging issues, the bug states and process.

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

  updated the definition of a regression

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

Changes:
  - all: https://git.openjdk.org/guide/pull/100/files
  - new: https://git.openjdk.org/guide/pull/100/files/7f838d22..3ab60291

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=100&range=04
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=100&range=03-04

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/guide/pull/100.diff
  Fetch: git fetch https://git.openjdk.org/guide.git pull/100/head:pull/100

PR: https://git.openjdk.org/guide/pull/100