RFR: clarify how to set the affects versions [v6]

[calnan]

> moved together information on how the set the affects version and the meaning of the (Rel)-na and (Rel)-wnf labelss

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

  updates from feedback

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Changes:
  - all: https://git.openjdk.org/guide/pull/119/files
  - new: https://git.openjdk.org/guide/pull/119/files/338a0eb5..01d5f61e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=119&range=05
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=119&range=04-05

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/guide/pull/119.diff
  Fetch: git fetch https://git.openjdk.org/guide.git pull/119/head:pull/119

PR: https://git.openjdk.org/guide/pull/119