Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/drop_nth.md

@@ -0,0 +1,44 @@
+---
+title: drop nth
+layout: command
+version: 0.59.0
+---
+
+Drop the selected rows.
+
+## Signature
+
+```> drop nth (row number or row range) ...rest```
+
+## Parameters
+
+ -  `row number or row range`: the number of the row to drop or a range to drop consecutive rows
+ -  `...rest`: the number of the row to drop
+
+## Examples
+
+Drop the first, second, and third row
+```shell
+> [sam,sarah,2,3,4,5] | drop nth 0 1 2
+```
+
+Drop the first, second, and third row
+```shell
+> [0,1,2,3,4,5] | drop nth 0 1 2
+```
+
+Drop rows 0 2 4
+```shell
+> [0,1,2,3,4,5] | drop nth 0 2 4
+```
+
+Drop rows 2 0 4
+```shell
+> [0,1,2,3,4,5] | drop nth 2 0 4
+```
+
+Drop range rows from second to fourth
+```shell
+> echo [first second third fourth fifth] | drop nth (1..3)
+```
+