Apply suggestions from code review of branch update-for-labthings0.0.12

Co-authored-by: Richard Bowman <richard.bowman@cantab.net>

src/openflexure_microscope_server/things/camera/picamera.py

@@ -71,8 +71,7 @@ class PicameraStreamOutput(Output):
     def __init__(self, stream: lt.outputs.MJPEGStream) -> None:
         """Create an output that puts frames in an MJPEGStream.
 
-        We need to pass the stream object, because new frame notifications happen in
-        the anyio event loop and frames are sent from a thread.
+        :param stream: The labthings MJPEGStream to send frames to.
         """
         Output.__init__(self)
         self.stream = stream
@@ -182,7 +181,7 @@ class StreamingPiCamera2(BaseCamera):
         """Override save_settings to ensure that camera properties don't recurse.
 
         This method is run by any Thing when a setting is saved. However, the
-        method reads the thing_setting. As reading the thing setting talks to the
+        method reads the setting. As reading the setting talks to the
         camera and calls save_settings if the value is not as expected, this could
         cause recursion. Also this means that saving one setting causes all others
         to be read each time.

tests/test_stage.py

@@ -288,11 +288,6 @@ def test_move_absolute(dummy_stage, path):
     3 paths are tried for each case of axis inversion. This checks both that the
     reported position changes as is input in path, and that the hardware position is
     inverted when appropriate.
-
-    NOTE: it is essential that `dummy_stage` is imported even if any time it is used
-    dummy stage could be used. This is because the fixture that creates stage client
-    handles adding the dummy_stage to a server. It needs to have been added to a
-    server for it not to throw errors about not being connected to a server.
     """
     # Note that the fixture is not reset. This is fine, because the stage_should work
     # no matter the starting position.