fix doc string of read_message_from_flat_slice_no_alloc()

capnp/src/serialize.rs

@@ -80,7 +80,7 @@ pub fn read_message_from_flat_slice<'a>(
 /// The slice is allowed to extend beyond the end of the message. On success, updates `slice` to point
 /// to the remaining bytes beyond the end of the message.
 ///
-/// Unlike read_message_from_flat_slice_no_alloc it does not do heap allocation
+/// Unlike [read_message_from_flat_slice], it does not do heap allocation.
 ///
 /// ALIGNMENT: If the "unaligned" feature is enabled, then there are no alignment requirements on `slice`.
 /// Otherwise, `slice` must be 8-byte aligned (attempts to read the message will trigger errors).