Fixing documentation errors and fixing unit test errors.

Author: rmhowe425

pandas/core/generic.py

@@ -2212,7 +2212,7 @@ def to_excel(
         {storage_options}
 
             .. versionadded:: {storage_options_versionadded}
-        engine_kwargs: dict, optional
+        engine_kwargs : dict
             Arbitrary keyword arguments passed to excel engine.
 
         See Also

pandas/tests/io/excel/test_writers.py

@@ -1122,7 +1122,7 @@ def test_engine_kwargs(self, engine, path):
             "odf": r"OpenDocumentSpreadsheet() got an unexpected keyword "
             r"argument 'foo'",
             "openpyxl": r"load_workbook() got an unexpected keyword argument 'foo'",
-            "xlsxwriter": r"Workbook.__init__() got an unexpected keyword "
+            "xlsxwriter": r"__init__() got an unexpected keyword "
             r"argument 'foo'",
         }