Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/to_yaml.md

@@ -0,0 +1,19 @@
+---
+title: to yaml
+layout: command
+version: 0.59.0
+---
+
+Convert table into .yaml/.yml text
+
+## Signature
+
+```> to yaml ```
+
+## Examples
+
+Outputs an YAML string representing the contents of this table
+```shell
+> [[foo bar]; ["1" "2"]] | to yaml
+```
+