improve face rec faq

docs/docs/configuration/face_recognition.md

@@ -133,6 +133,27 @@ Once front-facing images are performing well, start choosing slightly off-angle
 
 ## FAQ
 
+### How do I debug Face Recognition issues?
+
+Start with the [Usage](#usage) section and re-read the [Model Requirements](#model-requirements) above.
+
+1. Ensure `person` is being _detected_. A `person` will automatically be scanned by Frigate for a face. Any detected faces will appear in the Train tab in the Frigate UI's Face Library.
+
+   If you are using a Frigate+ or `face` detecting model:
+
+   - Watch the debug view (Settings --> Debug) to ensure that `face` is being detected along with `person`.
+   - You may need to adjust the `min_score` for the `face` object if faces are not being detected.
+
+   If you are **not** using a Frigate+ or `face` detecting model:
+
+   - Check your `detect` stream resolution and ensure it is sufficiently high enough to capture face details on `person` objects.
+   - You may need to lower your `detection_threshold` if faces are not being detected.
+
+2. Any detected faces will then be _recognized_.
+
+   - Make sure you have trained at least one face per the recommendations above.
+   - Adjust `recognition_threshold` settings per the suggestions [above](#advanced-configuration).
+
 ### Detection does not work well with blurry images?
 
 Accuracy is definitely a going to be improved with higher quality cameras / streams. It is important to look at the DORI (Detection Observation Recognition Identification) range of your camera, if that specification is posted. This specification explains the distance from the camera that a person can be detected, observed, recognized, and identified. The identification range is the most relevant here, and the distance listed by the camera is the furthest that face recognition will realistically work.

docs/docs/troubleshooting/edgetpu.md

@@ -55,10 +55,10 @@ The USB Coral can become stuck and need to be restarted, this can happen for a n
 
 ## PCIe Coral Not Detected
 
-The most common reason for the PCIe Coral not being detected is that the driver has not been installed. This process varies based on what OS and kernel that is being run. 
+The most common reason for the PCIe Coral not being detected is that the driver has not been installed. This process varies based on what OS and kernel that is being run.
 
 - In most cases [the Coral docs](https://coral.ai/docs/m2/get-started/#2-install-the-pcie-driver-and-edge-tpu-runtime) show how to install the driver for the PCIe based Coral.
-- For Ubuntu 22.04+ https://github.com/jnicolson/gasket-builder can be used to build and install the latest version of the driver.
+- For some newer Linux distros (for example, Ubuntu 22.04+), https://github.com/jnicolson/gasket-builder can be used to build and install the latest version of the driver.
 
 ## Attempting to load TPU as pci & Fatal Python error: Illegal instruction