ENH: Improve readability of output

For comparison, here is an excerpt of the before and after output
when running the tests with "python -m unittest discover -s tests"

Before
------

Checking tests/example.h
spell_check_file: tests/example.h, text/x-c++
Comment:  Mary had a little lamb
<class 'comment_parser.parsers.common.Comment'>
Comment:
<class 'comment_parser.parsers.common.Comment'>
Comment:  Prefix test words:
<class 'comment_parser.parsers.common.Comment'>
Comment:  sitkBanana
<class 'comment_parser.parsers.common.Comment'>
Error: sitkBanana
Trying without 'sitk' prefix: sitkBanana -> Banana
Comment:  vtkApple
<class 'comment_parser.parsers.common.Comment'>


After
-----

Checking tests/example.h
spell_check_file: tests/example.h, text/x-c++
Line 3:  Mary had a little lamb
Line 4:
Line 5:  Prefix test words:
Line 6:  sitkBanana
Error: sitkBanana
Trying without 'sitk' prefix: sitkBanana -> Banana
Line 7:  vtkApple
Error: vtkApple
Trying without 'vtk' prefix: vtkApple -> Apple

Author: jcfr

codespell.py

@@ -90,8 +90,7 @@ def spell_check_comment(
     """Check comment and return list of identified issues if any."""
 
     if output_lvl > 1:
-        print(f"Comment: {c}")
-        print(type(c))
+        print(f"Line {c.line_number()}: {c}")
 
     mistakes = []
     spell_checker.set_text(c.text())