database/sql: fix spelling mistake

Change-Id: I67db3b342929a7bd11f01bf3b9afb49f4da69a0a
Reviewed-on: https://go-review.googlesource.com/35841
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/database/sql/sql.go

@@ -2348,7 +2348,7 @@ func (rs *Rows) Scan(dest ...interface{}) error {
 }
 
 // rowsCloseHook returns a function so tests may install the
-// hook throug a test only mutex.
+// hook through a test only mutex.
 var rowsCloseHook = func() func(*Rows, *error) { return nil }
 
 func (rs *Rows) isClosed() bool {

src/database/sql/sql_test.go

@@ -2664,7 +2664,7 @@ func TestIssue18429(t *testing.T) {
 			if err != nil {
 				return
 			}
-			// This is expected to give a cancel error many, but not all the time.
+			// This is expected to give a cancel error most, but not all the time.
 			// Test failure will happen with a panic or other race condition being
 			// reported.
 			rows, _ := tx.QueryContext(ctx, "WAIT|"+qwait+"|SELECT|people|name|")