docs: add --edge to install section (#5767)

jsjoeio · repo-ranger[bot] · web-flow · commit e2f585f36849 · 2022-11-10T11:50:37.000-07:00
This adds documentation for the flag `--edge` which we've had for a while but forgot to document. Fixes #5717 Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>
diff --git a/docs/install.md b/docs/install.md
@@ -59,6 +59,7 @@ following flags:
 - `--prefix=/usr/local`: install a standalone release archive system-wide.
 - `--version=X.X.X`: install version `X.X.X` instead of latest version.
 - `--help`: see usage docs.
+- `--edge`: install the latest edge version (i.e. pre-release)
 
 When done, the install script prints out instructions for running and starting
 code-server.
