Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/to_csv.md

@@ -0,0 +1,29 @@
+---
+title: to csv
+layout: command
+version: 0.59.0
+---
+
+Convert table into .csv text 
+
+## Signature
+
+```> to csv --separator --noheaders```
+
+## Parameters
+
+ -  `--separator {string}`: a character to separate columns, defaults to ','
+ -  `--noheaders`: do not output the columns names as the first row
+
+## Examples
+
+Outputs an CSV string representing the contents of this table
+```shell
+> [[foo bar]; [1 2]] | to csv
+```
+
+Outputs an CSV string representing the contents of this table
+```shell
+> [[foo bar]; [1 2]] | to csv -s ';' 
+```
+