add documentation for show route (import|export) table

[Ondrej Zajicek]

On Sun, Oct 16, 2022 at 04:01:48PM +0200, Alexander Zubkov via Bird-users wrote:
> Hi,
> 
> I found out that one can "show route" for import and export tables.
> But that syntax is not documented. Patch is attached.

Hi

Thanks, merged

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
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