RFR: New section Making a change [v3]

[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 The old section "Fixing a bug" was mostly outdated so it has been replaced with a section "Making a change" that holds content relevant to working with the source code and making changes.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:

  has -> have
  
  Co-authored-by: Tobias Hartmann <tobias.hartmann at oracle.com>

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

Changes:
  - all: https://git.openjdk.org/guide/pull/131/files
  - new: https://git.openjdk.org/guide/pull/131/files/3d253641..6830448c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=131&range=02
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=131&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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