io: fix docs referring to clear_{read,write}_ready (#3957)

Author: blasrodri

tokio/src/io/poll_evented.rs

@@ -40,9 +40,8 @@ cfg_io_driver! {
     /// [`poll_read_ready`] again will also indicate read readiness.
     ///
     /// When the operation is attempted and is unable to succeed due to the I/O
-    /// resource not being ready, the caller must call `clear_read_ready` or
-    /// `clear_write_ready`. This clears the readiness state until a new
-    /// readiness event is received.
+    /// resource not being ready, the caller must call `clear_readiness`.
+    /// This clears the readiness state until a new readiness event is received.
     ///
     /// This allows the caller to implement additional functions. For example,
     /// [`TcpListener`] implements poll_accept by using [`poll_read_ready`] and