Autogenerate missing docs (#3514)

* Autogenerate missing docs

* Update ansi.md

* Rename question mark command docs

* Delete empty?.md

docs/commands/str-rpad.md

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+# str rpad
+pad a string with a character a certain length
+
+## Usage
+```shell
+> str rpad ...args {flags} 
+ ```
+
+## Parameters
+* ...args: optionally check if string contains pattern by column paths
+
+## Flags
+* -h, --help: Display this help message
+* -l, --length <integer> (required parameter): length to pad to
+* -c, --character <string> (required parameter): character to pad with
+
+## Examples
+  Right pad a string with a character a number of places
+```shell
+> echo 'nushell' | str rpad -l 10 -c '*'
+ ```
+
+  Right pad a string with a character a number of places
+```shell
+> echo '123' | str rpad -l 10 -c '0'
+ ```
+
+  Use rpad to truncate a string
+```shell
+> echo '123456789' | str rpad -l 3 -c '0'
+ ```
+
+  Use rpad to pad Unicode
+```shell
+> echo '▉' | str rpad -l 10 -c '▉'
+ ```
+