fix: update type completeness checklist after adding docstrings

Author: nightcityblade

src/trio/_tests/_check_type_completeness.json

@@ -18,15 +18,8 @@
     ],
     "Windows": [],
     "all": [
-        "No docstring found for class \"trio.MemoryReceiveChannel\"",
-        "No docstring found for class \"trio._channel.MemoryReceiveChannel\"",
-        "No docstring found for class \"trio.MemoryChannelStatistics\"",
-        "No docstring found for class \"trio._channel.MemoryChannelStatistics\"",
-        "No docstring found for class \"trio.MemorySendChannel\"",
-        "No docstring found for class \"trio._channel.MemorySendChannel\"",
         "No docstring found for class \"trio._core._run.Task\"",
         "No docstring found for class \"trio._socket.SocketType\"",
-        "No docstring found for function \"trio._highlevel_socket.SocketStream.send_all\"",
         "No docstring found for function \"trio._highlevel_socket.SocketStream.wait_send_all_might_not_block\"",
         "No docstring found for function \"trio._highlevel_socket.SocketStream.send_eof\"",
         "No docstring found for function \"trio._highlevel_socket.SocketStream.receive_some\"",