Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/random_decimal.md

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+---
+title: random decimal
+layout: command
+version: 0.59.0
+---
+
+Generate a random decimal within a range [min..max]
+
+## Signature
+
+```> random decimal (range)```
+
+## Parameters
+
+ -  `range`: Range of values
+
+## Examples
+
+Generate a default decimal value between 0 and 1
+```shell
+> random decimal
+```
+
+Generate a random decimal less than or equal to 500
+```shell
+> random decimal ..500
+```
+
+Generate a random decimal greater than or equal to 100000
+```shell
+> random decimal 100000..
+```
+
+Generate a random decimal between 1.0 and 1.1
+```shell
+> random decimal 1.0..1.1
+```
+