Change doc reference to read_csv to read_excel (#26317)

Author: deepyaman

pandas/io/excel/_base.py

@@ -151,7 +151,7 @@
 
     If a column or index contains an unparseable date, the entire column or
     index will be returned unaltered as an object data type. For non-standard
-    datetime parsing, use ``pd.to_datetime`` after ``pd.read_csv``
+    datetime parsing, use ``pd.to_datetime`` after ``pd.read_excel``.
 
     Note: A fast-path exists for iso8601-formatted dates.
 date_parser : function, optional