fix: typo in "Enable columnstore on a continuous aggregate"

[arajkumar]

Description

You will see the following error without this fix,

ALTER MATERIALIZED VIEW metrics_daily set (timescaledb.enable_columnstore = true,);
ERROR:  syntax error at or near ")"
LINE 1: ... metrics_daily set (timescaledb.enable_columnstore = true,);

Links

Fixes #[insert issue link, if any]

Writing help

For information about style and word usage, see the Contribution guide

Review checklists

Reviewers: use this section to ensure you have checked everything before approving this PR:

Subject matter expert (SME) review checklist

• Is the content technically accurate?
• Is the content complete?
• Is the content presented in a logical order?
• Does the content use appropriate names for features and products?
• Does the content provide relevant links to further information?

Documentation team review checklist

• Is the content free from typos?
• Does the content use plain English?
• Does the content contain clear sections for concepts, tasks, and references?
• Have any images been uploaded to the correct location, and are resolvable?
• If the page index was updated, are redirects required
  and have they been implemented?
• Have you checked the built version of this content?

[github-actions]

Allow 10 minutes from last push for the staging site to build. If the link doesn't work, try using incognito mode instead. For internal reviewers, check web-documentation repo actions for staging build status. Link to build for this PR: http://docs-dev.timescale.com/docs-arajkumar-fix-cagg-ins-typo