Auto merge of #11740 - weihanglo:issue/9707, r=epage

Enhance help texts of position args

Author: bors

src/bin/cargo/commands/run.rs

@@ -12,6 +12,7 @@ pub fn cli() -> Command {
         .arg_quiet()
         .arg(
             Arg::new("args")
+                .help("Arguments for the binary or example to run")
                 .value_parser(value_parser!(std::ffi::OsString))
                 .num_args(0..)
                 .trailing_var_arg(true),

src/bin/cargo/commands/rustc.rs

@@ -12,7 +12,7 @@ pub fn cli() -> Command {
         .arg(
             Arg::new("args")
                 .num_args(0..)
-                .help("Rustc flags")
+                .help("Extra rustc flags")
                 .trailing_var_arg(true),
         )
         .arg_package("Package to build")

src/bin/cargo/commands/rustdoc.rs

@@ -6,7 +6,12 @@ pub fn cli() -> Command {
     subcommand("rustdoc")
         .about("Build a package's documentation, using specified custom flags.")
         .arg_quiet()
-        .arg(Arg::new("args").num_args(0..).trailing_var_arg(true))
+        .arg(
+            Arg::new("args")
+                .help("Extra rustdoc flags")
+                .num_args(0..)
+                .trailing_var_arg(true),
+        )
         .arg(flag(
             "open",
             "Opens the docs in a browser after the operation",