feat(endpoints): rename behavior to outputs

"Outputs" is probably easier for most people to understand than "endpoints".

app/dts/behaviors.dtsi

@@ -10,4 +10,4 @@
 #include <behaviors/rgb_underglow.dtsi>
 #include <behaviors/bluetooth.dtsi>
 #include <behaviors/ext_power.dtsi>
-#include <behaviors/endpoints.dtsi>
+#include <behaviors/outputs.dtsi>

app/dts/behaviors/endpoints.dtsi

@@ -1,9 +0,0 @@
-/ {
-    behaviors {
-        end: behavior_endpoints {
-            compatible = "zmk,behavior-endpoints";
-            label = "ENDPOINTS";
-            #binding-cells = <1>;
-        };
-    };
-};

app/dts/behaviors/outputs.dtsi

@@ -0,0 +1,9 @@
+/ {
+    behaviors {
+        out: behavior_outputs {
+            compatible = "zmk,behavior-outputs";
+            label = "OUTPUTS";
+            #binding-cells = <1>;
+        };
+    };
+};

app/dts/bindings/behaviors/zmk,behavior-outputs.yaml

@@ -3,8 +3,8 @@
 # SPDX-License-Identifier: MIT
 #
 
-description: Endpoints Behavior
+description: Output Selection Behavior
 
-compatible: "zmk,behavior-endpoints"
+compatible: "zmk,behavior-outputs"
 
 include: one_param.yaml