uefi-macros: Update docstring

Author: nicholasbishop

uefi-macros/src/lib.rs

@@ -26,11 +26,11 @@ macro_rules! err {
 /// Attribute macro for marking structs as UEFI protocols.
 ///
 /// The macro takes one argument, either a GUID string or the path to a `Guid`
-/// constant.
+/// constant. The macro can only be applied to a struct. It implements the
+/// [`Protocol`] trait and the `unsafe` [`Identify`] trait for the struct.
 ///
-/// The macro can only be applied to a struct. It implements the
-/// [`Protocol`] trait and the `unsafe` [`Identify`] trait for the
-/// struct.
+/// Note that this does not automatically install a protocol. See the
+/// [`Protocol`] trait for details.
 ///
 /// # Safety
 ///