Autogenerate missing docs (#3514)

* Autogenerate missing docs

* Update ansi.md

* Rename question mark command docs

* Delete empty?.md

docs/commands/str-rtrim.md

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+# str rtrim
+trims whitespace or character from the end of text
+
+## Usage
+```shell
+> str rtrim ...args {flags} 
+ ```
+
+## Parameters
+* ...args: optionally trim text starting from the end by column paths
+
+## Flags
+* -h, --help: Display this help message
+* -c, --char <string>: character to trim (default: whitespace)
+
+## Examples
+  Trim whitespace from the end of string
+```shell
+> echo ' Nu shell ' | str rtrim
+ ```
+
+  Trim a specific character
+```shell
+> echo '=== Nu shell ===' | str rtrim -c '='
+ ```
+