Autogenerate missing docs (#3514)

* Autogenerate missing docs

* Update ansi.md

* Rename question mark command docs

* Delete empty?.md

docs/commands/math-stddev.md

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+# math stddev
+Finds the stddev of a list of numbers or tables
+
+## Usage
+```shell
+> math stddev {flags} 
+ ```
+
+## Flags
+* -h, --help: Display this help message
+* -s, --sample: calculate sample standard deviation
+
+## Examples
+  Get the stddev of a list of numbers
+```shell
+> echo [1 2 3 4 5] | math stddev
+ ```
+
+  Get the sample stddev of a list of numbers
+```shell
+> echo [1 2 3 4 5] | math stddev -s
+ ```
+