RFR: Updates to the JBS section of the OpenJDK Dev Guide [v9]

[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:

  Fixed a couple of typos, made sure bullets start with a capital and end with a full stop - except for non-sentence bullets.  Clarified how to close a duplicate

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Changes:
  - all: https://git.openjdk.org/guide/pull/100/files
  - new: https://git.openjdk.org/guide/pull/100/files/39c42112..1c44aa9e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=100&range=08
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=100&range=07-08

  Stats: 39 lines in 1 file changed: 1 ins; 0 del; 38 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