docs/extension-point: use consistent heading markup

This style of heading markup is more prevalent in these docs. This also
corrects the heading levels, since level two was skipped before.

Change-Id: I2e2e020aa23b541aa4b02a8b9ce45bb8082aaa70
1 file changed
tree: 17a12934efbebc208a98981c3761419578b3c4ca
  1. .settings/
  2. src/
  3. .gitignore
  4. .mailmap
  5. BUILD
  6. LICENSE