Comment spelling cleanup

Author: szepeviktor

CHANGELOG.md

@@ -449,7 +449,7 @@ Contributed by Marc Mueller (PR [20156](https://github.com/python/mypy/pull/2015
 For best performance, mypy can be compiled to C extension modules using mypyc. This makes
 mypy 3-5x faster than when interpreted with pure Python. We now build and upload mypyc
 accelerated mypy wheels for `win_arm64` and `cp314t-...` to PyPI, making it easy for Windows
-users on ARM and those using the free theading builds for Python 3.14 to realise this speedup
+users on ARM and those using the free threading builds for Python 3.14 to realise this speedup
 -- just `pip install` the latest mypy.
 
 Contributed by Marc Mueller

mypy/inspections.py

@@ -297,7 +297,7 @@ def cmp_types(x: TypeInfo, y: TypeInfo) -> int:
         result = {}
         for base in sorted_bases:
             if not combined_attrs[base]:
-                # Skip bases where everytihng was filtered out.
+                # Skip bases where everything was filtered out.
                 continue
             result[base] = combined_attrs[base]
         return result

mypy/plugins/dataclasses.py

@@ -914,7 +914,7 @@ def _infer_dataclass_attr_init_type(
 
         # Perform a simple-minded inference from the signature of __set__, if present.
         # We can't use mypy.checkmember here, since this plugin runs before type checking.
-        # We only support some basic scanerios here, which is hopefully sufficient for
+        # We only support some basic scenarios here, which is hopefully sufficient for
         # the vast majority of use cases.
         if not isinstance(t, Instance):
             return default