Update cli docs

docs/reference.md

@@ -14,4 +14,4 @@
 | `--markup-types` | `-t`  | List of markup types which shall be checked [possible values: md, html] |
 | `--root-dir` | `-r`  | All links to the file system starting with a slash on linux or backslash on windows will use another virtual root dir. For example the link in a file `[link](/dir/other/file.md)` checked with the cli arg `--root-dir /env/another/dir` will let *mlc* check the existence of `/env/another/dir/dir/other/file.md`. |
 | `<directory>`    |       | Path to directory which shall be checked with all sub-dirs. Can also be a specific filename which shall be checked. |
-| `--throttle`     |       | Number of milliseconds to wait in between web requests. Default is zero which means no throttling. Set this if you need to slow down the web request frequency to avoid `429 - Too Many Requests` responses. For example with `--throttle 15`, between each http check 15 ms will be waited. Note that this setting can slow down the link checker significantly. |
+| `--throttle`     |       | Number of milliseconds to wait in between web requests to the same host. Default is zero which means no throttling. Set this if you need to slow down the web request frequency to avoid `429 - Too Many Requests` responses. For example with `--throttle 15`, between each http check to the same host, 15 ms will be waited. Note that this setting can slow down the link checker. |

src/cli.rs

@@ -32,7 +32,7 @@ pub fn parse_args() -> Config {
         .arg(
             Arg::with_name("match-file-extension")
                 .long("match-file-extension")
-                .help("Do check for the exact file extension when searching for a file.")
+                .help("Do check for the exact file extension when searching for a file")
                 .required(false),
         )
         .arg(
@@ -62,7 +62,7 @@ pub fn parse_args() -> Config {
         .arg(
             Arg::with_name("throttle")
                 .long("throttle")
-                .help("Wait between http request for a defined number of milliseconds.")
+                .help("Wait between http request to the same host for a defined number of milliseconds")
                 .required(false)
                 .takes_value(true),
         )
@@ -83,7 +83,7 @@ pub fn parse_args() -> Config {
     let throttle = match matches.value_of("throttle") {
         Some(v) => v
             .parse()
-            .expect("Integer expected. Throttle time in milliseconds."),
+            .expect("Integer expected. Throttle time in milliseconds"),
         None => 0,
     };