Merge pull request #4506 from papparapa/mkfifo-move-help-strings-to-md-file

mkfifo: move help strings to markdown file

src/uu/mkfifo/mkfifo.md

@@ -0,0 +1,7 @@
+# mkfifo
+
+```
+mkfifo [OPTION]... NAME...
+```
+
+Create a FIFO with the given name.

src/uu/mkfifo/src/mkfifo.rs

@@ -10,10 +10,10 @@ use libc::mkfifo;
 use std::ffi::CString;
 use uucore::display::Quotable;
 use uucore::error::{UResult, USimpleError};
-use uucore::{format_usage, show};
+use uucore::{format_usage, help_about, help_usage, show};
 
-static USAGE: &str = "{} [OPTION]... NAME...";
-static ABOUT: &str = "Create a FIFO with the given name.";
+static USAGE: &str = help_usage!("mkfifo.md");
+static ABOUT: &str = help_about!("mkfifo.md");
 
 mod options {
     pub static MODE: &str = "mode";