Docs tweaks (#18025)

* face recognition usage instructions

* clarify lpr docs for motorcycles

* person must be detected before face

* add note about coral

* add note about local

* update reference config for face model size

* clarify reference config for face

docs/docs/configuration/face_recognition.md

@@ -3,7 +3,7 @@ id: face_recognition
 title: Face Recognition
 ---
 
-Face recognition identifies known individuals by matching detected faces with previously learned facial data. When a known person is recognized, their name will be added as a `sub_label`. This information is included in the UI, filters, as well as in notifications.
+Face recognition identifies known individuals by matching detected faces with previously learned facial data. When a known `person` is recognized, their name will be added as a `sub_label`. This information is included in the UI, filters, as well as in notifications.
 
 ## Model Requirements
 
@@ -13,6 +13,12 @@ When running a Frigate+ model (or any custom model that natively detects faces)
 
 When running a default COCO model or another model that does not include `face` as a detectable label, face detection will run via CV2 using a lightweight DNN model that runs on the CPU. In this case, you should _not_ define `face` in your list of objects to track.
 
+:::note
+
+Frigate needs to first detect a `person` before it can detect and recognize a face.
+
+:::
+
 ### Face Recognition
 
 Frigate has support for two face recognition model types:
@@ -22,6 +28,8 @@ Frigate has support for two face recognition model types:
 
 In both cases, a lightweight face landmark detection model is also used to align faces before running recognition.
 
+All of these features run locally on your system.
+
 ## Minimum System Requirements
 
 The `small` model is optimized for efficiency and runs on the CPU, most CPUs should run the model efficiently.
@@ -62,6 +70,13 @@ Fine-tune face recognition with these optional parameters:
 - `blur_confidence_filter`: Enables a filter that calculates how blurry the face is and adjusts the confidence based on this.
   - Default: `True`.
 
+## Usage
+
+1. **Enable face recognition** in your configuration file and restart Frigate.
+2. **Upload your face** using the **Add Face** button's wizard in the Face Library section of the Frigate UI.
+3. When Frigate detects and attempts to recognize a face, it will appear in the **Train** tab of the Face Library, along with its associated recognition confidence.
+4. From the **Train** tab, you can **assign the face** to a new or existing person to improve recognition accuracy for the future.
+
 ## Creating a Robust Training Set
 
 The number of images needed for a sufficient training set for face recognition varies depending on several factors: