Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/random_chars.md

@@ -0,0 +1,28 @@
+---
+title: random chars
+layout: command
+version: 0.59.0
+---
+
+Generate random chars
+
+## Signature
+
+```> random chars --length```
+
+## Parameters
+
+ -  `--length {int}`: Number of chars
+
+## Examples
+
+Generate random chars
+```shell
+> random chars
+```
+
+Generate random chars with specified length
+```shell
+> random chars -l 20
+```
+