Fix typos in comments

Co-authored-by: Alessandro Felder <alessandrofelder@users.noreply.github.com>

btrack/napari/reader.py

@@ -53,7 +53,7 @@ def reader_function(path: PathLike) -> List[LayerDataTuple]:
         (data, metadata, layer_type), where data is a numpy array, metadata is
         a dict of keyword arguments for the corresponding viewer.add_* method
         in napari, and layer_type is a lower-case string naming the type of
-        layer. Both "meta", and "layer_type" are optional. napari will default
+        layer. Both "metadata" and "layer_type" are optional. napari will default
         to layer_type=="image" if not provided
     """
     # handle both a string and a list of strings

tests/napari/test_reader.py

@@ -1,6 +1,6 @@
 import pytest
 
-# Only run tests is napari is installed
+# Only run tests if napari is installed
 napari_reader = pytest.importorskip("btrack.napari.reader")
 
 
@@ -11,6 +11,6 @@ def test_reader(hdf5_file_path):
     tracks = reader(hdf5_file_path)
     assert isinstance(tracks, list)
     # TODO: update the HDF file so that it has some tracks that can be read.
-    # For now this just checks that the reader can read an emtpy HDF5 file
+    # For now this just checks that the reader can read an empty HDF5 file
     # with no tracks in it
     assert len(tracks) == 0