chore(user-guide): Add docs for more commands

[gashcrumb]

This change adds notes for the /update-commit and /update-versions bot commands to the user guide.

rh-pre-commit.version: 2.3.2
rh-pre-commit.check-secrets: ENABLED

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

The file versions.json could not be synced from branch main into this because your PR is from a fork.

You should update the versions.json file with the following content:

{
    "backstage": "1.49.4",
    "node": "22.22.0",
    "cli": "1.10.5",
    "cliPackage": "@red-hat-developer-hub/cli"
}

[github-actions]

The file versions.json could not be synced from branch main into this because your PR is from a fork.

You should update the versions.json file with the following content:

{
    "backstage": "1.49.4",
    "node": "22.22.0",
    "cli": "1.10.6",
    "cliPackage": "@red-hat-developer-hub/cli"
}