fix(identity): correctly reference identity commands so exports work

[Ben Vesel (bennerv)]

When attempting to use the aaz-dev workflow tooling, I'm unable to export my azure-cli command_module. The flask app shows the below error.

[2026-07-14 18:08:27,814] ERROR in app: InvalidAPIUsage:
{
  "message": "Command not exist: identity create"
}
ERROR:aaz_dev.app.app:InvalidAPIUsage:
{
  "message": "Command not exist: identity create"
}

Adding the commands for identity to the readme.md below fixes the export issues.

[Ben Vesel (bennerv)]

#1010 also fixes this.