bug#64154: 29.0.92; Provide additional details on GnuPG and EPA usage in epa.texi

[Jens Schmidt]

On 2023-06-30  07:54, Eli Zaretskii wrote:

> Yes, please.  A manual that lacks Concept Index is not a good manual,
> IMO.  In fact, Concept Index should be the very first index in a
> manual; there are some good manuals which have only that and nothing
> else.

Another such possible systematic update I could do while touching 
things: Consistently title-casing node names and/or chapter/section 
titles.  OK or not OK?  I'm not sure about external references if case 
changes.

Thanks