[chore] Fix double the typos

[dmathieu]

Changes

This fixes a couple typos, which were reported in open-telemetry/opentelemetry-go#5048.

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• schema-next.yaml updated with changes to existing conventions.

[dmathieu]

The markdown failure seems unrelated to my changes (though somehow it doesn't fail on the CI main branch).