Some additions to the EasyPG Assistant's manual

[Jens Schmidt]

Hi,

I have been setting up GnuPG for Emacs/EPA lately for transparent file
encryption and decryption, and done so for the first time.  I've
condensed my experiences in some additions to the EPA texi file, see 
attached patch.  Of course, such experiences are highly personal, but at 
least on Stackoverflow others have been struggling with the same issues 
as I did ...

This patch still needs some brushing up, and some splitting up probably
as well.  It is based on emacs-29.

Just wanted to check whether the additions are by and large OK the way
they are.

WDYT?

epa.texi.patch
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