Add bitflags! with CompletionFlags for better UX.

Author: sugarraysam

src/cqueue.rs

@@ -297,8 +297,9 @@ impl Debug for Entry32 {
 }
 
 bitflags!(
+    /// Request specific information carried in CQE flags field.
     /// See man page for complete description:
-    /// https://man7.org/linux/man-pages/man2/io_uring_enter.2.html
+    /// https://man7.org/linux/man-pages/man7/io_uring.7.html
     #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
     pub struct CompletionFlags: u32 {
         /// If set, the upper 16 bits of the flags field carries the