Thanks for this contribution, @VickyMerzOwn! I've added a few nit-picky remarks.

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doc/build/setup.rst line 8 at r1 (raw file):

Prerequisite
-----------

Title underline should match length of title (the spinx build complains otherwise)

doc/build/setup.rst line 24 at r1 (raw file):

#. Make sure that you are using a clean and recently updated **Ubuntu 18.04**.
   This environment assumes you're running as a non-root user with ``sudo`` access.

Let's move this point to the Prerequisite(s!) also then. If you feel like it, you can also add a note saying that other versions (or systems) will usually be fine too, but some of the tooling may not work.

doc/build/setup.rst line 47 at r1 (raw file):

   ``bazel`` will resolve to the ``bazelisk`` command.

#. For this step, make sure you are in the ``scion`` repository root. To install the required dependencies, run:

Let's remove this sentence. This is already required for case in the preceding step.

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doc/build/setup.rst line 8 at r1 (raw file):

Done.

doc/build/setup.rst line 24 at r1 (raw file):

Done.

doc/build/setup.rst line 47 at r1 (raw file):

Done.

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doc/build/setup.rst line 47 at r1 (raw file):

Sorry, that's not what I had meant; don't remove the entire step, only remove the sentence "For this step, make sure you are in the scion repository root. ". We want to keep the install_deps step, like this:

#. To install the required dependencies, run:

   .. code-block:: bash

      ./tools/install_deps

doc/build/setup.rst line 12 at r2 (raw file):

   Other Ubuntu versions (or systems) will usually be fine too, but some of the tooling may not work.
   This environment assumes you're running as a non-root user with ``sudo`` access.
   

Please remove the trailing whitespace.

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doc/build/setup.rst line 47 at r1 (raw file):

Done.

doc/build/setup.rst line 12 at r2 (raw file):

Done.

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