Reword comment.

src/cargo/core/source/source_id.rs

@@ -618,10 +618,9 @@ impl Ord for SourceKind {
 // Otherwise please just leave a comment in your PR as to why the hash value is
 // changing and why the old value can't be easily preserved.
 //
-// The hash value differs depending on endianess and bit-width since Rust 1.45
-// (see https://github.com/rust-lang/rust/issues/74215). We run this test only
-// on 64-bit little-endian platforms which are most commonly used for
-// development and tested in CI.
+// The hash value depends on endianness and bit-width, so we only run this test on 
+// little-endian 64-bit CPUs (such as x86-64 and ARM64) where it matches the 
+// well-known value.
 #[test]
 #[cfg(all(target_endian = "little", target_pointer_width = "64"))]
 fn test_cratesio_hash() {