RFR: 8312882: Update the CONTRIBUTING.md with pointers to lifecycle of a PR [v2]

[Jesse Glick]

> @jaikiran in https://github.com/openjdk/jdk/pull/12871#issuecomment-1612310113 pointed me to a resource I had not previously found. https://openjdk.org/contribute is fine at a high level but still says things like
> 
>> When your change is ready, send a message to the appropriate development list…
> 
> which clearly predates Skara, and does not apparently link to anything more current. Whereas this https://github.com/openjdk/jdk/blob/master/doc/building.md is thorough and discoverable, finding accurate guidelines for proposing pull requests was tough.

Jesse Glick has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Making `building.md` also link only to the guide
 - Linking only to the guide, as suggested by @JesperIRL: https://github.com/openjdk/jdk/pull/14716#issuecomment-1670908305
 - Merge branch 'master' of https://github.com/openjdk/jdk into patch-1
 - 8312882: Update the CONTRIBUTING.md with pointers to lifecycle of a PR

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14716/files
  - new: https://git.openjdk.org/jdk/pull/14716/files/15c631eb..649736c6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14716&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14716&range=00-01

  Stats: 22126 lines in 871 files changed: 10372 ins; 5538 del; 6216 mod
  Patch: https://git.openjdk.org/jdk/pull/14716.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14716/head:pull/14716

PR: https://git.openjdk.org/jdk/pull/14716