Fix typo in a dataclasses comment. (GH-25454)
diff --git a/Lib/dataclasses.py b/Lib/dataclasses.py
index 3ccfbbd..1b95bb9 100644
--- a/Lib/dataclasses.py
+++ b/Lib/dataclasses.py
@@ -718,7 +718,7 @@ def _get_field(cls, a_name, a_type):
# In addition to checking for actual types here, also check for
# string annotations. get_type_hints() won't always work for us
# (see https://github.com/python/typing/issues/508 for example),
- # plus it's expensive and would require an eval for every stirng
+ # plus it's expensive and would require an eval for every string
# annotation. So, make a best effort to see if this is a ClassVar
# or InitVar using regex's and checking that the thing referenced
# is actually of the correct type.