Fix SRXL2 ESC build on non-DSHOT targets and regenerate Settings.md

CI on maintenance-10.x surfaced two issues:

- On targets without USE_DSHOT (e.g. BEEROTORF4) the build failed:
  `pwmCompleteMotorUpdate` and the SRXL2 case in pwmMotorPreconfigure
  lived inside `#if defined(USE_DSHOT)`, while fc_core.c calls
  pwmCompleteMotorUpdate whenever USE_DSHOT || USE_SRXL2_ESC. Move
  pwmCompleteMotorUpdate under `USE_DSHOT || USE_SRXL2_ESC`, keep its
  digital body behind USE_DSHOT, and drop the unnecessary
  motorConfigDigitalUpdateInterval() call from the SRXL2 case (SRXL2
  paces itself in srxl2EscUpdate()).

- Regenerate docs/Settings.md so the SRXL2 value added to
  motor_pwm_protocol is documented (settings_md CI check).

Verified by building BEEROTORF4 (no DSHOT), SPEEDYBEEF405WING (DSHOT)
and SITL.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GroYFi23gHDgj43xrTAVaY

Author: claude

docs/Settings.md

@@ -3273,6 +3273,7 @@ Protocol that is used to send motor updates to ESCs. Possible values - STANDARD,
 | DSHOT150 |  |
 | DSHOT300 |  |
 | DSHOT600 |  |
+| SRXL2 |  |
 
 ---
 

src/main/drivers/pwm_output.c

@@ -524,12 +524,27 @@ static bool executeDShotCommands(void){
 }
 #endif
 
+#else // digital motor protocol
+
+// This stub is needed to avoid ESC_SENSOR dependency on DSHOT
+void pwmRequestMotorTelemetry(int motorIndex)
+{
+    UNUSED(motorIndex);
+}
+
+#endif
+
+// pwmCompleteMotorUpdate must also exist for SRXL2-only targets (no DSHOT),
+// where it just drives the SRXL2 transmit. The digital/DSHOT body below is
+// kept behind USE_DSHOT so it is omitted on those targets.
+#if defined(USE_DSHOT) || defined(USE_SRXL2_ESC)
 void pwmCompleteMotorUpdate(void) {
     if (initMotorProtocol == PWM_TYPE_SRXL2) {
         srxl2EscUpdate(micros());
         return;
     }
 
+#ifdef USE_DSHOT
     // This only makes sense for digital motor protocols
     if (!isMotorProtocolDigital()) {
         return;
@@ -585,16 +600,8 @@ void pwmCompleteMotorUpdate(void) {
 #endif
     }
 #endif
+#endif
 }
-
-#else // digital motor protocol
-
-// This stub is needed to avoid ESC_SENSOR dependency on DSHOT
-void pwmRequestMotorTelemetry(int motorIndex)
-{
-    UNUSED(motorIndex);
-}
-
 #endif
 
 void pwmMotorPreconfigure(void)
@@ -620,8 +627,11 @@ void pwmMotorPreconfigure(void)
             break;
 
         case PWM_TYPE_SRXL2:
+            // SRXL2 paces its own transmissions inside srxl2EscUpdate() and
+            // pwmCompleteMotorUpdate() returns early for it, so the digital update
+            // interval is unused here. Avoid calling motorConfigDigitalUpdateInterval()
+            // which is only defined when USE_DSHOT is enabled.
             if (srxl2EscInit()) {
-                motorConfigDigitalUpdateInterval(getEscUpdateFrequency());
                 motorWritePtr = pwmWriteSrxl2;
             } else {
                 motorWritePtr = pwmWriteNull;