Update CameraMixin documentation

Author: IceTank

common/src/main/java/com/lambda/mixin/render/CameraMixin.java

@@ -105,6 +105,39 @@ private float onDistanceUpdate(float desiredCameraDistance) {
         return desiredCameraDistance;
     }
 
+    /**
+     * Modifies the arguments for setting the camera rotation.
+     * Mixes into 4 arguments:
+     * <p>Experimental Minecart Controller:</p>
+     * <pre>
+     * if (experimentalMinecartController.hasCurrentLerpSteps()) {
+     *     Vec3d vec3d = minecartEntity.getPassengerRidingPos(focusedEntity).subtract(minecartEntity.getPos()).subtract(focusedEntity.getVehicleAttachmentPos(minecartEntity)).add(new Vec3d(0.0, (double)MathHelper.lerp(tickProgress, this.lastCameraY, this.cameraY), 0.0));
+     *     this.setRotation(focusedEntity.getYaw(tickProgress), focusedEntity.getPitch(tickProgress));
+     *     this.setPos(experimentalMinecartController.getLerpedPosition(tickProgress).add(vec3d));
+     *     break label39;
+     * }
+     * </pre>
+     * <p>Default Camera:</p>
+     * <pre>
+     * this.setRotation(focusedEntity.getYaw(tickProgress), focusedEntity.getPitch(tickProgress));
+     * this.setPos(MathHelper.lerp((double)tickProgress, focusedEntity.lastX, focusedEntity.getX()), MathHelper.lerp((double)tickProgress, focusedEntity.lastY, focusedEntity.getY()) + (double)MathHelper.lerp(tickProgress, this.lastCameraY, this.cameraY), MathHelper.lerp((double)tickProgress, focusedEntity.lastZ, focusedEntity.getZ()));
+     * </pre>
+     * <p>Third person camera:</p>
+     * <pre>
+     * if (thirdPerson) {
+     *     if (inverseView) {
+     *         this.setRotation(this.yaw + 180.0F, -this.pitch);
+     *     }
+     *     // ...
+     * }
+     * </pre>
+     * <p>When the player is focused on another Living Entity:</p>
+     * <pre>
+     * Direction direction = ((LivingEntity)focusedEntity).getSleepingDirection();
+     * this.setRotation(direction != null ? direction.getPositiveHorizontalDegrees() - 180.0F : 0.0F, 0.0F);
+     * this.moveBy(0.0F, 0.3F, 0.0F);
+     * </pre>
+     */
     @ModifyArgs(method = "update", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/render/Camera;setRotation(FF)V"))
     private void onUpdateSetRotationArgs(Args args) {
         if (FreeLook.INSTANCE.isEnabled()) {