Update compiler/rustc_error_codes/src/error_codes/E0622.md

Co-authored-by: Ralf Jung <[email protected]>

Author: BLANKatGITHUB

compiler/rustc_error_codes/src/error_codes/E0622.md

@@ -7,6 +7,7 @@ Erroneous code example:
 #![allow(internal_features)]
 
 #[rustc_intrinsic]
+#[allow(non_upper_case_globals)]
 pub static atomic_singlethreadfence_seqcst: fn() = || {};
 // error: intrinsic must be a function