Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/exit.md

@@ -1,30 +1,17 @@
-# exit
+---
+title: exit
+layout: command
+version: 0.59.0
+---
 
-Exits the nu shell. If you have multiple nu shells, use `exit --now` to exit all of them.
+Runs a script file in the current context.
 
-## Examples
+## Signature
 
-```shell
-> exit
-```
+```> exit (exit-code) --now```
+
+## Parameters
+
+ -  `exit-code`: Exit code to return immediately with
+ -  `--now`: Exit out of the shell immediately
 
-```shell
-> shells
-━━━┯━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
- # │   │ name       │ path
-───┼───┼────────────┼─────────────────────────────────────
- 0 │   │ filesystem │ /home/jonathanturner/Source/nushell
- 1 │   │ filesystem │ /home
- 2 │ X │ filesystem │ /usr
-━━━┷━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
-> exit
-> shells
-━━━┯━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
- # │   │ name       │ path
-───┼───┼────────────┼─────────────────────────────────────
- 0 │   │ filesystem │ /home/jonathanturner/Source/nushell
- 1 │ X │ filesystem │ /home
-━━━┷━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
-> exit --now
-exits both the shells
-```