update text for E0736 and E0739

compiler/rustc_error_codes/src/error_codes/E0736.md

@@ -1,14 +1,24 @@
-`#[track_caller]` and `#[naked]` cannot both be applied to the same function.
+Functions marked with the `#[naked]` attribute are restricted in what other
+code generation attributes they may be marked with.
+
+The following code generation attributes are incompatible with `#[naked]`:
+
+  * `#[inline]`
+  * `#[track_caller]`
+  * `#[target_feature]`
 
 Erroneous code example:
 
 ```compile_fail,E0736
+#[inline]
 #[naked]
-#[track_caller]
 fn foo() {}
 ```
 
-This is primarily due to ABI incompatibilities between the two attributes.
-See [RFC 2091] for details on this and other limitations.
+These incompatibilities are due to the fact that naked functions deliberately
+impose strict restrictions regarding the code that the compiler is
+allowed to produce for this function.
 
-[RFC 2091]: https://github.com/rust-lang/rfcs/blob/master/text/2091-inline-semantic.md
+See [the reference page for codegen attributes] for more information.
+
+[the reference page for codegen attributes]: https://doc.rust-lang.org/reference/attributes/codegen.html

compiler/rustc_error_codes/src/error_codes/E0739.md

@@ -1,4 +1,4 @@
-`#[track_caller]` can not be applied on struct.
+`#[track_caller]` must  be applied to a function
 
 Erroneous code example: