update gorun instructions on the wiki

[Moses Moore]

Can't file a bug report at the wiki, nor can I fix the wiki myself (which is ironic, since that's how a "wikiwiki" is supposed to be used).

https://wiki.ubuntu.com/gorun#How_to_build_and_install_gorun_from_source states:

How to build and install gorun from source: Just use goinstall:
$ goinstall launchpad.net/gorun

However, the example on the same page does not work. Instead I get the following error:
/usr/bin/gorun: bad interpreter: No such file or directory

Looks like gorun was installed to /usr/lib/go/bin/gorun. If teaching goinstall to drop a softlink into /usr/bin/ is too messy, then just fixing the wiki page so it has the correct #! line in the examples would do it.