Fix spelling

Author: edoaltamura

.pylintdict

@@ -500,6 +500,7 @@ sdg
 seealso
 semidefinite
 serializable
+serializablemodelmixin
 shalev
 shanno
 shende

releasenotes/notes/serializable-model-update-io-b708094e41edeb35.yaml

@@ -2,9 +2,9 @@
 upgrade:
   - |
     Added new methods :meth:`to_dill` and :meth:`from_dill`, with improved docstrings and examples.
-    Deprecated :meth:`save` and :meth:`load` in favor of the `{to/from}_dill`.
+    Deprecated :meth:`save` and :meth:`load` in favor of the `{to/from}_dill` methods.
 deprecations:
   - |
     The methods :meth:`SerializableModelMixin.save` and :meth:`SerializableModelMixin.load` have
-    been deprecated and will be removed (target v.0.9.0). Please use
+    been deprecated and will be removed (target v0.9.0). Please use
     :meth:`SerializableModelMixin.to_dill` and :meth:`SerializableModelMixin.from_dill` instead.