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Use suggested post-installation steps

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Thanks, @jvns!
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docs/Installation.md
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@ -95,20 +95,17 @@ Create a Homebrew installation wherever you extract the tarball. Whichever `brew
## Post-installation steps
Before completing installation, Homebrew installer will provide some required "Next steps" instructions.
These instructions configure your shell to evaluate the output of `brew shellenv`,
which will load `brew` into your shell environment for use.
When you install Homebrew, it prints some directions for updating your shell's config.
If you don't follow those directions, Homebrew will not work.
While it's difficult to document the precise path for every shell,
typically, what follows must be in your shell's `rc` or `profile` file:
You need to update your shell's config file (which file exactly depends on your shell, for example `~/.bashrc` or `~/.zshrc`) to include this:
```sh
eval "<Homebrew prefix path>/bin/brew shellenv)"
```
where `${HOMEBREW_PREFIX}` is the Homebrew installation directory.
Replace this with the installation directory on your system.
See the [FAQ about default installation locations](FAQ.md#why-should-i-install-homebrew-in-the-default-location).
Replace `<Homebrew prefix path>` with the directory where Homebrew is installed on your system.
You can find Homebrew's default install location [in this FAQ entry](https://docs.brew.sh/FAQ#why-should-i-install-homebrew-in-the-default-location).
For more insight, re-run the installer or inspect [the installer's source](https://github.com/Homebrew/install/blob/deacfa6a6e62e5f4002baf9e1fac7a96e9aa5d41/install.sh#L1072-L1088)
to see how the installer constructs the path it recommends.