Fix typo and colon in comment

src/hip_memory.cpp

@@ -1989,7 +1989,7 @@ hipError_t hipFree(void* ptr) {
 #endif
         am_status_t status = hc::am_memtracker_getinfo(&amPointerInfo, ptr);
         if (status == AM_SUCCESS) {
-            /*if (amPointerInfo._hostPointer == NULL) */ //TODO Fix this when there is proper Managed memeory support
+            /*if (amPointerInfo._hostPointer == NULL) */ //TODO: Fix it when there is proper managed memory support
             {
                 if (HIP_SYNC_FREE) {
                     // Synchronize all devices, all streams