docs: fix contribution-guide docker run

[yukinakanaka]

Fixes: #2293

Current docker run doesn't work. ENTRYPOINT is set as /usr/bin/tetragon in Dockerfile, so arguments for docker run are not needed.

Tetragon's container was created successfully via the new command:

$ docker run --name tetragon \
   --rm -it -d --pid=host \
   --cgroupns=host --privileged \
   -v /sys/kernel/btf/vmlinux:/var/lib/tetragon/btf \
   cilium/tetragon:latest
27016a8ee505aed876f9d7426e60d4ca347689ae56acd1f321192deae2b142f9

$ docker ps
CONTAINER ID   IMAGE                    COMMAND                  CREATED         STATUS          PORTS                       NAMES
27016a8ee505   cilium/tetragon:latest   "/usr/bin/tetragon"      3 seconds ago   Up 2 seconds                                tetragon

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[mtardy]

Thanks a lot this is correct, I changed the entrypoint and didn't update this part of the doc, thanks again! :)