RFR: Added section on maintainer-pain [v3]

[Jesper Wilhelmsson]

> Added section on maintainer-pain

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

  Explicit examples and new header

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Changes:
  - all: https://git.openjdk.java.net/guide/pull/37/files
  - new: https://git.openjdk.java.net/guide/pull/37/files/ac1986b4..15c22582

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=guide&pr=37&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=guide&pr=37&range=01-02

  Stats: 16 lines in 1 file changed: 10 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/guide/pull/37.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/37/head:pull/37

PR: https://git.openjdk.java.net/guide/pull/37