Fix comment typo

Source/astcenc_entry.cpp

@@ -1139,7 +1139,7 @@ astcenc_error astcenc_compress_cancel(
 
 	// Cancel compression before cancelling avg. This avoids the race condition
 	// where cancelling them in the other order could see a compression worker
-	// starting to proces even though some of the avg data is undefined.
+	// starting to process even though some of the avg data is undefined.
 	ctxo->manage_compress.cancel();
 	ctxo->manage_avg.cancel();
 	return ASTCENC_SUCCESS;