rtems-docs README.txt: how to specify a particular sphinx version

[Gedare Bloom]

This looks fine to me.

On Thu, Nov 9, 2023 at 4:15 AM Andrew.Butterfield at scss.tcd.ie
<Andrew.Butterfield at scss.tcd.ie> wrote:
>
> Adds some lines to indicate how to install a specific sphinx version
> Patches are attached.
>
> Regards, Andrew
>
>
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> Lero at TCD, Head of Software Foundations & Verification Research Group
> School of Computer Science and Statistics,
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> http://www.scss.tcd.ie/Andrew.Butterfield/ <http://www.scss.tcd.ie/Andrew.Butterfield/>
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