Autogenerate missing docs (#3514)

* Autogenerate missing docs

* Update ansi.md

* Rename question mark command docs

* Delete empty?.md

docs/commands/str-length.md

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+# str length
+outputs the lengths of the strings in the pipeline
+
+## Usage
+```shell
+> str length ...args {flags} 
+ ```
+
+## Parameters
+* ...args: optionally find length of text by column paths
+
+## Flags
+* -h, --help: Display this help message
+
+## Examples
+  Return the lengths of multiple strings
+```shell
+> echo 'hello' | str length
+ ```
+
+  Return the lengths of multiple strings
+```shell
+> echo 'hi' 'there' | str length
+ ```
+