bug#64154: Some additions to the EasyPG Assistant's manual

[Jens Schmidt]

On 2023-07-09  13:26, Eli Zaretskii wrote:

> There's no need to fix everything (although you get bonus points for
> doing so), it is enough not to add such problems in new text.

Turned out that most references were mine, anyway, so little bonus.  I 
changed them to "GnuPG Agent" where the "abstract agent" more likely is 
being referred to and to @command{gpg-agent} where the "concrete 
command" is meant.  (The GnuPG manual is, um, extremely inconsistent in 
naming this thing, so nothing to be learnt from it.)

Other than that I followed your proposals, new patch attached.

There is this one open question regarding a completely different manual 
("Emacs auth-source") from one of my previous mails, though:

> Finally, I noticed that section "GnuPG and EasyPG Assistant
> Configuration(auth)" duplicates some of the information in section
> "Caching Passphrases(epa)", which means that these will be out of sync
> as soon as my changes have landed.  WDYT about that?

0002-Add-basic-usage-information-and-fix-references.patch
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