RFR: 831: Longer time for autoclose on passive PRs

[Robin Westberg]

Wait longer before automatically trying to close draft pull requests. Also mention how to reopen a closed one.

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Commit messages:
 - Wait longer for draft prs, mention /open

Changes: https://git.openjdk.java.net/skara/pull/1131/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1131&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-831
  Stats: 7 lines in 2 files changed: 5 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/1131.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1131/head:pull/1131

PR: https://git.openjdk.java.net/skara/pull/1131