Rename mj_stackAllocBytes to mj_stackAllocByte

PiperOrigin-RevId: 559071711
Change-Id: I19072e07ac86ee0486703aa48b0dceb297f5f893

src/engine/engine_io.h

@@ -109,7 +109,7 @@ MJAPI mjtNum* mj_stackAlloc(mjData* d, int size);
 MJAPI int* mj_stackAllocInt(mjData* d, int size);
 
 // mjData stack allocate for a specific size of bytes
-MJAPI void* mj_stackAllocBytes(mjData* d, size_t size);
+MJAPI void* mj_stackAllocByte(mjData* d, size_t size);
 
 // de-allocate data
 MJAPI void mj_deleteData(mjData* d);