docs(builder): Add help text

examples/tutorial_builder/04_01_enum.md

@@ -4,11 +4,31 @@ A simple to use, efficient, and full-featured Command Line Argument Parser
 
 Usage: 04_01_enum[EXE] <MODE>
 
+Arguments:
+  <MODE>
+          What mode to run the program in
+
+          Possible values:
+          - fast: Run swiftly
+          - slow: Crawl slowly but steadily
+
+Options:
+  -h, --help
+          Print help information (use `-h` for a summary)
+
+  -V, --version
+          Print version information
+
+$ 04_01_enum -h
+A simple to use, efficient, and full-featured Command Line Argument Parser
+
+Usage: 04_01_enum[EXE] <MODE>
+
 Arguments:
   <MODE>  What mode to run the program in [possible values: fast, slow]
 
 Options:
-  -h, --help     Print help information
+  -h, --help     Print help information (use `--help` for more detail)
   -V, --version  Print version information
 
 $ 04_01_enum fast

examples/tutorial_builder/04_01_enum.rs

@@ -14,8 +14,8 @@ impl ValueEnum for Mode {
 
     fn to_possible_value<'a>(&self) -> Option<PossibleValue> {
         Some(match self {
-            Mode::Fast => PossibleValue::new("fast"),
-            Mode::Slow => PossibleValue::new("slow"),
+            Mode::Fast => PossibleValue::new("fast").help("Run swiftly"),
+            Mode::Slow => PossibleValue::new("slow").help("Crawl slowly but steadily"),
         })
     }
 }