spec: Document our circuit close reasons
In or.h, we define the reason to close a circuit:
/* Reasons why we (or a remote OR) might close a circuit. See tor-spec.txt for
* documentation of these. */
#define END_CIRC_REASON_MIN_ 0
#define END_CIRC_REASON_NONE 0
#define END_CIRC_REASON_TORPROTOCOL 1
#define END_CIRC_REASON_INTERNAL 2
#define END_CIRC_REASON_REQUESTED 3
...Even though it says "See tor-spec.txt", those values aren't defined at all in tor-spec.txt, only the stream reasons are.
This is a bit annoying because these values don't have any documentation on why and when they should be used.
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