[tor-bugs] #4726 [Tor Bridge]: Doxyzenize the file-level documentation of transports.c.

[Tor Bug Tracker & Wiki]

#4726: Doxyzenize the file-level documentation of transports.c.
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 Reporter:  asn         |          Owner:                    
     Type:  defect      |         Status:  new               
 Priority:  minor       |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Bridge  |        Version:                    
 Keywords:              |         Parent:                    
   Points:              |   Actualpoints:                    
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 `transports.c` has a big documentation blob documenting how the transports
 subsystem works.

 Unfortunately, this is not currently visible by doxygen.

 We should put it in the file-level Doxygen header so that it shows nicely
 in Doxygen documentation.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4726>
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