Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/math_round.md

@@ -0,0 +1,28 @@
+---
+title: math round
+layout: command
+version: 0.59.0
+---
+
+Applies the round function to a list of numbers
+
+## Signature
+
+```> math round --precision```
+
+## Parameters
+
+ -  `--precision {number}`: digits of precision
+
+## Examples
+
+Apply the round function to a list of numbers
+```shell
+> [1.5 2.3 -3.1] | math round
+```
+
+Apply the round function with precision specified
+```shell
+> [1.555 2.333 -3.111] | math round -p 2
+```
+