update comment only

src/platforms/rp2040.h

@@ -31,7 +31,7 @@
 
     void setTimer(uint32_t us_interval) {
         cancel_repeating_timer(&timer);
-        // todo: actually should be -init_clock so that timer is set to start init_clock us after last tick, instead of init_clock us after finished processing last tick!
+        // todo: actually should be -us_interval so that timer is set to start init_clock us after last tick, instead of init_clock us after finished processing last tick!
         add_repeating_timer_us(us_interval, &handlerISR, NULL, &timer);
     }
 #else
@@ -91,7 +91,7 @@
 
     void setTimer(uint32_t us_interval) {
         cancel_repeating_timer(&timer);
-        // todo: actually should be -init_clock so that timer is set to start init_clock us after last tick, instead of init_clock us after finished processing last tick!
+        // todo: actually should be -us_interval so that timer is set to start init_clock us after last tick, instead of init_clock us after finished processing last tick!
         add_repeating_timer_us(us_interval, &handlerISR, NULL, &timer);
     }