bug#12181: 24.1.50; doc of `switch-to-buffer'

[Chong Yidong]

"Drew Adams" <drew.adams@oracle.com> writes:

> It says that the function displays the buffer in the selected window.
> But later it says that it might display it in another window or it might
> raise an error and not display it at all.
>  
> The description should be reworded to say that it generally _tries_ to
> display the buffer in the selected window.  Otherwise it just sounds
> contradictory.

This is pretty pedantic, but I clarified the text anyway.