Document config_merge on alter_job() (2.29.0) - #417

Describe your changes

Documents the new config_merge parameter on alter_job(), which merges keys into a job's existing config instead of replacing it.

Dev PR: timescale/timescaledb#10225

Affected pages

• /reference/timescaledb/jobs-automation/alter_job

• 🧪 Component kitchen sink — check for visual regressions if you changed components, styles, or dependencies.

Related Issues

Checklist before requesting a review

• - This is ready for review. If not, raise as a draft PR
• - I have reviewed my changes.
• - I have confirmed the content is technically accurate.
• - I have tested any code that is added or updated on the latest available version.
• - I have confirmed the content is free of typos or grammar errors.
• - I have verified all images and videos are clear and match production (or dev for unreleased features).
• - I have checked the component kitchen sink for any visual breakage (only needed if you changed components, styles, or dependencies). A link to this PR's own preview appears under Affected pages once the build deploys.
• - This references a feature that is public. If not, add a note and we can schedule the merge for after the feature release.