Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/into_decimal.md

@@ -0,0 +1,33 @@
+---
+title: into decimal
+layout: command
+version: 0.59.0
+---
+
+converts text into decimal
+
+## Signature
+
+```> into decimal ...rest```
+
+## Parameters
+
+ -  `...rest`: optionally convert text into decimal by column paths
+
+## Examples
+
+Convert string to integer in table
+```shell
+> [[num]; ['5.01']] | into decimal num
+```
+
+Convert string to integer
+```shell
+> '1.345' | into decimal
+```
+
+Convert decimal to integer
+```shell
+> '-5.9' | into decimal
+```
+