Fix a minor comment typo. No code changes.

src/select.c

@@ -5306,7 +5306,7 @@ static void finalizeAggFunctions(Parse *pParse, AggInfo *pAggInfo){
 **
 ** If regAcc is non-zero and there are no min() or max() aggregates
 ** in pAggInfo, then only populate the pAggInfo->nAccumulator accumulator
-** registers i register regAcc contains 0. The caller will take care
+** registers if register regAcc contains 0. The caller will take care
 ** of setting and clearing regAcc.
 */
 static void updateAccumulator(Parse *pParse, int regAcc, AggInfo *pAggInfo){