Autogenerate missing docs (#3514)

* Autogenerate missing docs

* Update ansi.md

* Rename question mark command docs

* Delete empty?.md

docs/commands/math-abs.md

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+# math abs
+Returns absolute values of a list of numbers
+
+## Usage
+```shell
+> math abs {flags} 
+ ```
+
+## Flags
+* -h, --help: Display this help message
+
+## Examples
+  Get absolute of each value in a list of numbers
+```shell
+> echo [-50 -100.0 25] | math abs
+ ```
+