Update InSpec versions (#4508)

Signed-off-by: Ian Maddaus <[email protected]>

Author: IanMadd

content/inspec/_index.md

@@ -4,4 +4,4 @@ title = "Chef InSpec"
 
 - [Chef InSpec resource packs](/inspec/resource_packs)
 - [Chef InSpec 7.0](/inspec/7.0/)
-- [Chef InSpec 6.8](/inspec/6.8/)
+- [Chef InSpec 5/6](/inspec/6.8/)