[PATCH gnupg] doc: update default-new-key-algo to ed25519

[Jacob Bachmeyer]

Bernhard Reiter wrote:
>> I suggest striking "what was" and revising, leaving "can be changed to
>> the previous default value, which" to make the text flow less awkwardly.
>>     
>
> Thanks, new patch version attached.
>   

The problem for me is "the value of what was the previous default" is 
awkward; I suggest instead saying "the previous default value" there.  
Is this an awkward phrasing to optimize TeX typesetting?


-- Jacob