feat: update help text

Author: jackton1

README.md

@@ -68,13 +68,13 @@ Options:
 
 -h, --help              Show this help message and exit.
 -v, --VERSION           Show the VERSION and exit.
--k, --keys              The keys to use to generate the files. (Required)
+-k, --keys              Space delimited list of keys to extract from the JSON output. (Required)
 -o, --outputs           The JSON output to use. (Required)
 -d, --directory         The directory to output the files to. (Required)
 -e, --extension         The extension to use for the files. (Optional, defaults to txt)
 
 Example:
-        json2file --keys=foo,bar --outputs="{\"foo\": \"value1\", \"bar\": \"value2\"}" --directory=/tmp --extension=txt
+        json2file --keys="foo bar" --outputs="{\"foo\": \"value1\", \"bar\": \"value2\"}" --directory=/tmp --extension=txt
 ```
 
 *   Free software: [MIT license](LICENSE)

src/main.rs

@@ -257,7 +257,7 @@ fn main() {
         println!("Options:\n");
         println!("-h, --help\t\tShow this help message and exit.");
         println!("-v, --VERSION\t\tShow the VERSION and exit.");
-        println!("-k, --keys\t\tThe keys to use to generate the files. (Required)");
+        println!("-k, --keys\t\tSpace delimited list of keys to extract from the JSON output. (Required)");
         println!("-o, --outputs\t\tThe JSON output to use. (Required)");
         println!("-d, --directory\t\tThe directory to output the files to. (Required)");
         println!(