docs(ai/sentry-cli): Add link to commands reference in Key Commands section (#17343)

## DESCRIBE YOUR PR

Addresses user feedback from docs.sentry.io/ai/sentry-cli/.

- Added a direct link to `https://cli.sentry.dev/commands/` in the **Key
Commands** section intro paragraph, so users can immediately discover
the full command reference without having to scroll to the bottom of the
page.

Refs DOCS-AJG

## IS YOUR CHANGE URGENT?

- [x] None: Not urgent, can wait up to 1 week+

## PRE-MERGE CHECKLIST

- [ ] Checked Vercel preview for correctness, including links
- [ ] PR was reviewed and approved by any necessary SMEs
- [ ] PR was reviewed and approved by a member of the docs team

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Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Sergiy Dybskiy <s@serg.tech>

Author: 3 people

docs/ai/sentry-cli.mdx

@@ -74,7 +74,7 @@ Create API tokens in your [Sentry account settings](https://sentry.io/settings/a
 
 ## Key Commands
 
-The CLI auto-detects your project context, so most commands work without specifying a project or organization.
+The CLI auto-detects your project context, so most commands work without specifying a project or organization. For a complete list of available commands, see the [commands reference](https://cli.sentry.dev/commands/).
 
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