RFR: Section about the release process [v4]

[Jesper Wilhelmsson]

> Answering some common questions around the release process.

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

  More on backing out a change

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Changes:
  - all: https://git.openjdk.java.net/guide/pull/62/files
  - new: https://git.openjdk.java.net/guide/pull/62/files/32bf9285..5d54f57f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=guide&pr=62&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=guide&pr=62&range=02-03

  Stats: 12 lines in 1 file changed: 10 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/guide/pull/62.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/62/head:pull/62

PR: https://git.openjdk.java.net/guide/pull/62