You should be using the [Ask Ubuntu Toolbar Buttons](https://stackapps.com/questions/2405/ask-ubuntu-toolbar-buttons-a-set-of-toolbar-buttons-for-ask-ubuntu-that-make-i) UserScript!

Not only do you get a button in the toolbar for inserting links to manpages, but you also get a button for inserting links to packages and inserting links to PPAs.

For the record, the following markdown is generated by the script for the `ping` command:

    [manpage for the `ping` command ![Manpage icon](https://i.sstatic.net/Eq5sS.png)](http://manpages.ubuntu.com/ping)

Rendered as:

[manpage for the `ping` command ![Manpage icon](https://i.sstatic.net/Eq5sS.png)](http://manpages.ubuntu.com/ping)