Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/dfr_arg-sort.md

@@ -0,0 +1,28 @@
+---
+title: dfr arg-sort
+layout: command
+version: 0.59.0
+---
+
+Returns indexes for a sorted series
+
+## Signature
+
+```> dfr arg-sort --reverse```
+
+## Parameters
+
+ -  `--reverse`: reverse order
+
+## Examples
+
+Returns indexes for a sorted series
+```shell
+> [1 2 2 3 3] | dfr to-df | dfr arg-sort
+```
+
+Returns indexes for a sorted series
+```shell
+> [1 2 2 3 3] | dfr to-df | dfr arg-sort -r
+```
+