randn's help text

[John W. Eaton]

On 19-May-2008, Moritz Borgmann wrote:

| I think the attached is even slightly more precise. I find the term 
| "unitary" confusing in scalar context, so I replaced it with 
| "variance one". I didn't bother to add my name, hope that's OK with 
| you, Thomas.

I applied this changeset.

Thanks,

jwe