Clarify Command::new behavior if passed programs with arguments

Author: jieyouxu

library/std/src/process.rs

@@ -629,6 +629,26 @@ impl Command {
     ///     .spawn()
     ///     .expect("sh command failed to start");
     /// ```
+    ///
+    /// # Caveats
+    ///
+    /// [`Command::new`] is only intended to accept the path of the program. If you pass a program
+    /// path along with arguments such as `ls -l` for the program `ls` and argument `-l`, it will
+    /// try to search for `ls -l` literally.
+    ///
+    /// ```no_run (example demonstrating incorrect usage)
+    /// use std::process::Command;
+    ///
+    /// // Does not launch `ls`, will try to launch a program named `ls -l` literally.
+    /// Command::new("ls -l")
+    ///     .spawn()
+    ///     .unwrap();
+    /// ```
+    ///
+    /// The arguments need to be passed separately, such as via [`arg`] or [`args`].
+    ///
+    /// [`arg`]: Self::arg
+    /// [`args`]: Self::args
     #[stable(feature = "process", since = "1.0.0")]
     pub fn new<S: AsRef<OsStr>>(program: S) -> Command {
         Command { inner: imp::Command::new(program.as_ref()) }