Update docs on GetCommandLine.

export_test.go

diff --git a/export_test.go b/export_test.go
index 92c6b54..9318fee 100644
--- a/export_test.go
+++ b/export_test.go
@@ -23,7 +23,7 @@
 	Usage = usage
 }
 
-// CommandLine returns the default FlagSet.
+// GetCommandLine returns the default FlagSet.
 func GetCommandLine() *FlagSet {
 	return CommandLine
 }