Internal doc typo fixes reported in [forum:01d15f21b6|forum post 01d15f21b6].

Author: sgbeal

src/func.c

@@ -1919,7 +1919,7 @@ static void kahanBabuskaNeumaierInit(
 ** that it returns NULL if it sums over no inputs.  TOTAL returns
 ** 0.0 in that case.  In addition, TOTAL always returns a float where
 ** SUM might return an integer if it never encounters a floating point
-** value.  TOTAL never fails, but SUM might through an exception if
+** value.  TOTAL never fails, but SUM might throw an exception if
 ** it overflows an integer.
 */
 static void sumStep(sqlite3_context *context, int argc, sqlite3_value **argv){

src/util.c

@@ -1639,7 +1639,7 @@ int sqlite3MulInt64(i64 *pA, i64 iB){
 }
 
 /*
-** Compute the absolute value of a 32-bit signed integer, of possible.  Or
+** Compute the absolute value of a 32-bit signed integer, if possible.  Or
 ** if the integer has a value of -2147483648, return +2147483647
 */
 int sqlite3AbsInt32(int x){