Autogenerate missing docs (#3514)

* Autogenerate missing docs

* Update ansi.md

* Rename question mark command docs

* Delete empty?.md

docs/commands/str-find-replace.md

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+# str find-replace
+finds and replaces text
+
+## Usage
+```shell
+> str find-replace <find> <replace> ...args {flags} 
+ ```
+
+## Parameters
+* `<find>` the pattern to find
+* `<replace>` the replacement pattern
+* ...args: optionally find and replace text by column paths
+
+## Flags
+* -h, --help: Display this help message
+* -a, --all: replace all occurrences of find string
+
+## Examples
+  Find and replace contents with capture group
+```shell
+> echo 'my_library.rb' | str find-replace '(.+).rb' '$1.nu'
+ ```
+
+  Find and replace all occurrences of find string
+```shell
+> echo 'abc abc abc' | str find-replace -a 'b' 'z'
+ ```
+