refactor(docs): Change behavior to behaviors

Makes a better URL.

docs/docs/behaviors/outputs.md

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+---
+title: Output Selection Behavior
+sidebar_label: Output Selection
+---
+
+## Summary
+
+The output behavior allows selecting whether keyboard output is sent to the
+USB or bluetooth connection when both are connected. This allows connecting a
+keyboard to USB for power but outputting to a different device over bluetooth.
+
+By default, output is sent to USB when both USB and BLE are connected.
+Once you select a different output, it will be remembered until you change it again.
+
+## Output Command Defines
+
+Output command defines are provided through the [`dt-bindings/zmk/outputs.h`](https://github.com/zmkfirmware/zmk/blob/main/app/include/dt-bindings/zmk/outputs.h)
+header, which is added at the top of the keymap file:
+
+```
+#include <dt-bindings/zmk/outputs.h>
+```
+
+This allows you to reference the actions defined in this header:
+
+| Define    | Action                                          |
+| --------- | ----------------------------------------------- |
+| `OUT_USB` | Prefer sending to USB                           |
+| `OUT_BLE` | Prefer sending to the current bluetooth profile |
+| `OUT_TOG` | Toggle between USB and BLE                      |
+
+## Output Selection Behavior
+
+The output selection behavior changes the preferred output on press.
+
+### Behavior Binding
+
+- Reference: `&out`
+- Parameter #1: Command, e.g. `OUT_BLE`
+
+### Examples
+
+1. Behavior binding to prefer sending keyboard output to USB
+
+   ```
+   &out OUT_USB
+   ```
+
+1. Behavior binding to prefer sending keyboard output to the current bluetooth profile
+
+   ```
+   &out OUT_BLE
+   ```
+
+1. Behavior binding to toggle between preferring USB and BLE
+
+   ```
+   &out OUT_TOG
+   ```