Replaces the unqualified `wrapper` task name with the
root-project-qualified
`:wrapper` in the two places this repo names it:
- `.github/workflows/demo-job-summary.yml` — the kotlin-dsl sample
invocation
- `docs/wrapper-validation.md` — the guidance for regenerating an
unverifiable
`gradle-wrapper.jar`
An unqualified `wrapper` matches the task in every project of a
multi-project
build. The root-qualified form is unambiguous, matches the gradle/gradle
convention, and is required under Configure on Demand.
Part of the org-wide rollout tracked in gradle/gradle-private#5228;
original
issue gradle/gradle#37761.
Signed-off-by: Christoph Obexer <cobexer@gradle.com>
