stack-2.9.3: doc/upgrade_command.md

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# The `stack upgrade` command

Either:

~~~text
stack upgrade [--binary-only] [--binary-platform ARG] [--force-download]
              [--binary-version ARG] [--github-org ARG] [--github-repo ARG]
~~~

or:

~~~text
stack upgrade [--source-only] [--git] [--git-repo ARG] [--git-branch ARG]
~~~

`stack upgrade` will get a new version of Stack, either from an existing
binary distribution (pass the `--binary-only` flag, the default) or from
compiling source code (pass the `--source-only` flag). The `--binary-only` and
`--source-only` flags are alternatives.

`--git` is a convenient way to get the most recent version from the `master`
branch, for those testing and living on the bleeding edge.