[Mutt] #3400: mailto url support should be documented

[Mutt <fleas@xxxxxxxx>]

#3400: mailto url support should be documented
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 Reporter:  pweis  |       Owner:  pdmef
     Type:  task   |      Status:  new  
 Priority:  minor  |   Milestone:       
Component:  doc    |     Version:       
 Keywords:         |  
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 Neither the manpage nor the manual mention that mutt can be called with a
 mailto url instead of an email address.

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Ticket URL: <http://dev.mutt.org/trac/ticket/3400>
Mutt <http://www.mutt.org/>
The Mutt mail user agent