fix: update SourcePushAdd.description

[mdeslandescoveo]

Updated string used in https://docs.coveo.com/en/cli/#coveo-sourcepushadd-sourceid and not being rendered properly. See https://github.com/coveo/doc_jekyll-public-site/pull/14390/files#r2439063203

[github-actions]

Sorry @mdeslandescoveo, this PR does not satisifies all conditions of mergeability:

• Required status check "Lint" is failing.
• You're not authorized to push to this branch.
• Visit https://docs.github.com/repositories/configuring-branches-and-merges-in-your-repository/managing-protected-branches/about-protected-branches for more information.

Modify your pull request to satisfies them and check the box below to try again:

• Merge!

You can also reach out to a maintainer if you think your contribution should be merged regardless of the reported issues.

[mdeslandescoveo]

@jpmarceau @louis-bompart Just closing this PR. We'll make the CLI .md file static, as mentioned in https://github.com/coveo/doc_jekyll-public-site/pull/14390/files#r2439071672 .