Autogenerate missing docs (#3514)

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docs/commands/str-index-of.md

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+# str index-of
+Returns starting index of given pattern in string counting from 0. Returns -1 when there are no results.
+
+## Usage
+```shell
+> str index-of <pattern> ...args {flags} 
+ ```
+
+## Parameters
+* `<pattern>` the pattern to find index of
+* ...args: optionally returns index of pattern in string by column paths
+
+## Flags
+* -h, --help: Display this help message
+* -r, --range <any>: optional start and/or end index
+* -e, --end: search from the end of the string
+
+## Examples
+  Returns index of pattern in string
+```shell
+> echo 'my_library.rb' | str index-of '.rb'
+ ```
+
+  Returns index of pattern in string with start index
+```shell
+> echo '.rb.rb' | str index-of '.rb' -r '1,'
+ ```
+
+  Returns index of pattern in string with end index
+```shell
+> echo '123456' | str index-of '6' -r ',4'
+ ```
+
+  Returns index of pattern in string with start and end index
+```shell
+> echo '123456' | str index-of '3' -r '1,4'
+ ```
+
+  Alternatively you can use this form
+```shell
+> echo '123456' | str index-of '3' -r [1 4]
+ ```
+
+  Returns index of pattern in string
+```shell
+> echo '/this/is/some/path/file.txt' | str index-of '/' -e
+ ```
+