more: move help strings to markdown file

src/uu/more/more.md

@@ -0,0 +1,7 @@
+# more
+
+```
+more [OPTIONS] <FILE>...
+```
+
+A file perusal filter for CRT viewing.

src/uu/more/src/more.rs

@@ -28,8 +28,11 @@ use unicode_segmentation::UnicodeSegmentation;
 use unicode_width::UnicodeWidthStr;
 use uucore::display::Quotable;
 use uucore::error::{UResult, USimpleError, UUsageError};
+use uucore::{format_usage, help_about, help_usage};
 
+const ABOUT: &str = help_about!("more.md");
 const BELL: &str = "\x07";
+const USAGE: &str = help_usage!("more.md");
 
 pub mod options {
     pub const SILENT: &str = "silent";
@@ -97,7 +100,8 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
 
 pub fn uu_app() -> Command {
     Command::new(uucore::util_name())
-        .about("A file perusal filter for CRT viewing.")
+        .about(ABOUT)
+        .override_usage(format_usage(USAGE))
         .version(crate_version!())
         .infer_long_args(true)
         .arg(