Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/dfr_rolling.md

@@ -0,0 +1,29 @@
+---
+title: dfr rolling
+layout: command
+version: 0.59.0
+---
+
+Rolling calculation for a series
+
+## Signature
+
+```> dfr rolling (type) (window)```
+
+## Parameters
+
+ -  `type`: rolling operation
+ -  `window`: Window size for rolling
+
+## Examples
+
+Rolling sum for a series
+```shell
+> [1 2 3 4 5] | dfr to-df | dfr rolling sum 2 | dfr drop-nulls
+```
+
+Rolling max for a series
+```shell
+> [1 2 3 4 5] | dfr to-df | dfr rolling max 2 | dfr drop-nulls
+```
+