document control.txt

If functional (#40947 (closed)), then on Debian:

sudo cat /run/tor/control.txt

PORT=127.0.0.1:9052
...
UNIX_PORT=/run/tor/control

In Tor source code does not mention control.txt literally. Also not web search results for control.txt yet at time of writing. I am however pretty sure it is creatd by Tor since Tor source code file src/feature/control/control.c mentions PORT= and UNIX_PORT=.

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