Fix typo in the dataclasses's doc (GH-8896) (GH-8897)

(cherry picked from commit 075b3c325913475be16650f7cb2a99f3136623b9)

Co-authored-by: Daniel Dương <dduong42@users.noreply.github.com>
diff --git a/Doc/library/dataclasses.rst b/Doc/library/dataclasses.rst
index e9af20a..2efa2c5 100644
--- a/Doc/library/dataclasses.rst
+++ b/Doc/library/dataclasses.rst
@@ -448,7 +448,7 @@
 the optional :meth:`__post_init__` method.  They are not otherwise used
 by dataclasses.
 
-For example, suppose a field will be initialzed from a database, if a
+For example, suppose a field will be initialized from a database, if a
 value is not provided when creating the class::
 
   @dataclass