Documentation feedback: ignore_auth_filters

## Documentation Feedback 📝

#### The highlighted text:

> `ignore_auth_filters: ""`

#### The comment on the text:

I followed the instruction and when I went to apply the config I got:

```
...
Summary:
Created: 1
Updated: 4
Deleted: 0
Error: 1 errors occurred:
while processing event: {Create} plugin oidc for service a4aa9722-a1aa-4546-b375-5bbb634755bb failed: HTTP status 400 (message: "schema violation (config.ignore_auth_filters: length must be at least 1)")
```

I updated my config to:

> `ignore_auth_filters: "yes"`

and re-applied. Success.
___
B.C. government DevHub URL:
Markdown URL:

Open documentation/how-to/keycloak-rbac.md and review the example containing ignore_auth_filters: "". Confirm the documented value satisfies the reported configuration validation, then update the example and verify the rendered documentation no longer instructs users to apply the invalid empty value.

Written by the indexing model from the issue text.