Disambiguate between nsjail _container_ and _command_ in README for easier reading.
- Being a n00b to this project I feel this makes the onboarding of use with Docker somewhat easier by removing duplicated/overloaded terms.
To launch nsjail in a docker container clone the repository and build the docker image:
<pre>
-docker build -t nsjail .
+docker build -t nsjailcontainer .
</pre>
This will build up an image containing njsail and kafel.
-From now you can either use it in another Dockerfile (`FROM nsjail`) or directly:
+From now you can either use it in another Dockerfile (`FROM nsjailcontainer`) or directly:
<pre>
-docker run --privileged --rm -it nsjail nsjail --user 99999 --group 99999 --disable_proc --chroot / --time_limit 30 /bin/bash
+docker run --privileged --rm -it nsjailcontainer nsjail --user 99999 --group 99999 --disable_proc --chroot / --time_limit 30 /bin/bash
</pre>
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