Compress actuator_moment memory using nJmom <= nu x nv.

PiperOrigin-RevId: 698446692
Change-Id: I49c9633e12129a1e690724db82d1f11204e41d9c

src/engine/engine_core_smooth.c

@@ -1087,7 +1087,7 @@ void mj_transmission(const mjModel* m, mjData* d) {
         int refid = m->actuator_trnid[2*i+1];
         if (!jacref) jacref = mj_stackAllocNum(d, 3*nv);
 
-        // intialize last dof address for each body
+        // initialize last dof address for each body
         int b0 = m->body_weldid[m->site_bodyid[id]];
         int b1 = m->body_weldid[m->site_bodyid[refid]];
         int dofadr0 = m->body_dofadr[b0] + m->body_dofnum[b0] - 1;