RFR: Extend documentation regarding logging [v3]

[Johan Sjölen]

> Hi!
> 
> Here's some suggested improvements to the logging documentation. It's currently just a draft, but please feel welcome to come with any suggestions.

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

  ResourceMark is not necessary for UL

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

Changes:
  - all: https://git.openjdk.org/guide/pull/91/files
  - new: https://git.openjdk.org/guide/pull/91/files/c76cb03a..04e5e33a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=91&range=02
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=91&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/guide/pull/91.diff
  Fetch: git fetch https://git.openjdk.org/guide pull/91/head:pull/91

PR: https://git.openjdk.org/guide/pull/91