uefi-macros: Update docstring

Author: nicholasbishop

uefi-macros/src/lib.rs

@@ -25,12 +25,11 @@ 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.
-///
-/// 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, and takes one argument, either a
+/// GUID string or the path to a `Guid` constant. It implements the [`Protocol`]
+/// trait and the `unsafe` [`Identify`] trait for the struct. This allows
+/// opening the protocol, but does nnot automatically install a protocol. See
+/// the [`Protocol`] trait for details.
 ///
 /// # Safety
 ///