fix spelling mistakes

my/core/__main__.py

@@ -15,7 +15,7 @@ import functools
 @functools.lru_cache()
 def mypy_cmd() -> Optional[Sequence[str]]:
     try:
-        # preferrably, use mypy from current python env
+        # preferably, use mypy from current python env
         import mypy
         return ['python3', '-m', 'mypy']
     except ImportError:

my/core/common.py

@@ -123,7 +123,7 @@ def _is_compressed(p: Path) -> bool:
     return p.suffix in {'.xz', '.lz4', '.zstd'}
 
 
-# TODO support '' for emtpy path
+# TODO support '' for empty path
 DEFAULT_GLOB = '*'
 def get_files(
         pp: Paths,