RFR: New section Making a change [v5]

[Jesper Wilhelmsson]

> The old section "Fixing a bug" was mostly outdated so it has been replaced with a section "Making a change" that holds content relevant to working with the source code and making changes. The still relevant parts of Fixing a bug has been moved to the appropriate places.
> 
> Another change that followed from this was the new section "Responsibilities of a Reviewer".

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

  Updated text

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Changes:
  - all: https://git.openjdk.org/guide/pull/131/files
  - new: https://git.openjdk.org/guide/pull/131/files/82b65198..9a46435a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=131&range=04
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=131&range=03-04

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/guide/pull/131.diff
  Fetch: git fetch https://git.openjdk.org/guide.git pull/131/head:pull/131

PR: https://git.openjdk.org/guide/pull/131