Miscellaneous fixes (0.17 beta) (#21867)

* Adjust title prompt to have less rigidity

* Improve motion boxes handling for features that don't require motion

* Improve handling of classes starting with digits

* Improve vehicle nuance

* tweak lpr docs

* Improve grammar

* Don't allow # in face name

* add password requirements to new user dialog

* change password requirements

* Clenaup

---------

Co-authored-by: Josh Hawkins <32435876+hawkeye217@users.noreply.github.com>

docs/docs/configuration/authentication.md

@@ -29,6 +29,10 @@ auth:
   reset_admin_password: true
 ```
 
+## Password guidance
+
+Constructing secure passwords and managing them properly is important. Frigate requires a minimum length of 12 characters. For guidance on password standards see [NIST SP 800-63B](https://pages.nist.gov/800-63-3/sp800-63b.html). To learn what makes a password truly secure, read this [article](https://medium.com/peerio/how-to-build-a-billion-dollar-password-3d92568d9277).
+
 ## Login failure rate limiting
 
 In order to limit the risk of brute force attacks, rate limiting is available for login failures. This is implemented with SlowApi, and the string notation for valid values is available in [the documentation](https://limits.readthedocs.io/en/stable/quickstart.html#examples).

docs/docs/configuration/license_plate_recognition.md

@@ -381,6 +381,7 @@ Start with ["Why isn't my license plate being detected and recognized?"](#why-is
      ```yaml
      lpr:
        enabled: true
+       device: CPU
        debug_save_plates: true
      ```