fix error_codes markdown files

Author: folkertdev

compiler/rustc_error_codes/src/error_codes/E0775.md

@@ -6,8 +6,7 @@ Erroneous code example:
 ```compile_fail,E0775
 #![feature(cmse_nonsecure_entry)]
 
-#[cmse_nonsecure_entry]
-pub extern "C" fn entry_function() {}
+pub extern "C-cmse-nonsecure-entry" fn entry_function() {}
 ```
 
 To fix this error, compile your code for a Rust target that supports the

compiler/rustc_error_codes/src/error_codes/E0776.md

@@ -4,7 +4,7 @@
 
 Erroneous code example:
 
-```compile_fail,E0776
+```
 #![feature(cmse_nonsecure_entry)]
 
 #[no_mangle]