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

[Andrew.Butterfield at scss.tcd.ie]

Adds some lines to indicate how to install a specific sphinx version
Patches are attached.

Regards, Andrew


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Andrew Butterfield Tel: +353-1-896-2517 Fax: +353-1-677-2204 
Lero at TCD, Head of Software Foundations & Verification Research Group 
School of Computer Science and Statistics, 
Room G.39, O'Reilly Institute, Trinity College, University of Dublin 
http://www.scss.tcd.ie/Andrew.Butterfield/ <http://www.scss.tcd.ie/Andrew.Butterfield/> 
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