message: docs: Prepend apt-get with sudo
  Also fixed the formatting for apt-get to be a one-liner that can easily be copied and pasted.
diff: @@ -28,15 +28,16 @@ for how to update or override dependencies.
  1. Install the latest version of [Bazel](https://bazel.build/versions/master/docs/install.html) in your environment.
  2. Install external dependencies libtool, cmake, ninja, realpath and curl libraries separately.
  -On Ubuntu, run the following commands:
  -```
  - apt-get install libtool
  - apt-get install cmake
  - apt-get install realpath
  - apt-get install clang-format-7
  - apt-get install automake
  - apt-get install ninja-build
  - apt-get install curl
  +On Ubuntu, run the following command:
  +```
  +sudo apt-get install \
  + libtool \
  + cmake \
  + realpath \
  + clang-format-7 \
  + automake \
  + ninja-build \
  + curl
  ```
  On Fedora (maybe also other red hat distros), run the following:
  