address issues

Signed-off-by: Johannes Feichtner <johannes@web-wack.at>

Author: Churro

cyclonedx/model/license.py

@@ -476,7 +476,7 @@ def details(self) -> 'SortedSet[ExpressionDetails]':
         Details for parts of the expression.
 
         Returns:
-            `Iterable[ExpressionDetails]` if set else `None`
+            Set of `ExpressionDetails`
         """
         return self._details
 
@@ -583,7 +583,7 @@ def __deserialize_license_expression_details_xml(
         expression_value = li.get('expression')
         if not expression_value:
             raise CycloneDxDeserializationException(f'unexpected content: {li!r}')
-        license_expression = LicenseExpression.from_xml(  # type:ignore[attr-defined]
+        license_expression: LicenseExpression = LicenseExpression.from_xml(  # type:ignore[attr-defined]
             li, default_ns)
         license_expression.value = expression_value
         return license_expression