RFR: Section on PRs [v3]

[Jesper Wilhelmsson]

> Some tips for creating pull requests.

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

  Fixes after reviews

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

Changes:
  - all: https://git.openjdk.java.net/guide/pull/79/files
  - new: https://git.openjdk.java.net/guide/pull/79/files/07c33db1..f4f10652

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=guide&pr=79&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=guide&pr=79&range=01-02

  Stats: 41 lines in 1 file changed: 34 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/guide/pull/79.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/79/head:pull/79

PR: https://git.openjdk.java.net/guide/pull/79