all: fix typos
caught by https://github.com/lyda/misspell-check.
R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/6949072
diff --git a/src/pkg/database/sql/sql.go b/src/pkg/database/sql/sql.go
index e59d013..e7c7780 100644
--- a/src/pkg/database/sql/sql.go
+++ b/src/pkg/database/sql/sql.go
@@ -266,7 +266,7 @@
var putConnHook func(*DB, driver.Conn)
// putConn adds a connection to the db's free pool.
-// err is optionally the last error that occured on this connection.
+// err is optionally the last error that occurred on this connection.
func (db *DB) putConn(c driver.Conn, err error) {
if err == driver.ErrBadConn {
// Don't reuse bad connections.
