Correct spelling errors in annotations in locks.go
@@ -11,7 +11,7 @@ import (
// define a global in process lock to prevent two goroutines writing to the
// same file.
//
-// This is prety unsophisticated for now. In the future, we'd probably like to
+// This is pretty unsophisticated for now. In the future, we'd probably like to
// have more information about who is holding which locks, as well as better
// error reporting.
