workspace/load-session command does not exist

### What did you expect to happen?

I was trying to find the documentation for how to handle workspaces. My workspaces I think are getting saved in project folders? So I was attempting to figure out how to load workspaces from files specifically. Which lead me into the [`modules/ui/workspaces/README.org`](https://github.com/hlissner/doom-emacs/blob/master/modules/ui/workspaces/README.org) but they list a command of `+workspace/load-session` which does not exist.

### What actually happened?

I remained confused by the documentation?

### Describe your attempts to resolve the issue

I think the correct answer is doom/load-session? But I'm not really sure.

### Steps to reproduce

1. Open Doom Emacs
2. M-x load-session
3. See that the only load-session is doom/load-session with a TODO on it?

### System Information

https://pastebin.com/nu0w8EVT