docs(test): inline concise comments and remove extra notes file

Author: Stevengre

tests/integration/normalise-filter.jq

@@ -29,4 +29,5 @@
     ( .types | map(select(.[0].FunType) | sort) )
   ] | flatten(1) )
 }
+# drop unstable compiler-internal ids that are unrelated to this regression
 | walk(if type == "object" then del(.def_id) else . end)

tests/integration/programs/static-vtable-nonbuiltin-deref.rs

@@ -4,5 +4,6 @@ static S: u8 = 7;
 const OBJS: [&'static dyn Debug; 1] = [&S as &dyn Debug];
 
 fn main() {
+    // Keep trait-object constant usage so both Static and VTable allocs are emitted.
     std::hint::black_box(OBJS[0]);
 }