RFR: Updates to the JBS section of the OpenJDK Dev Guide [v13]

[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:

  changed label from 'cleanup' vs. 'noreg-cleanup'

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Changes:
  - all: https://git.openjdk.org/guide/pull/100/files
  - new: https://git.openjdk.org/guide/pull/100/files/245870b3..eac0f510

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=100&range=12
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=100&range=11-12

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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