[DOC] improving the ExcelWriter docstring (pandas-dev#47568)

improved excelwrite docstring

Author: noatamir

pandas/io/excel/_base.py

@@ -871,11 +871,14 @@ class ExcelWriter(metaclass=abc.ABCMeta):
     """
     Class for writing DataFrame objects into excel sheets.
 
-    Default is to use :
-    * xlwt for xls
-    * xlsxwriter for xlsx if xlsxwriter is installed otherwise openpyxl
-    * odf for ods.
-    See DataFrame.to_excel for typical usage.
+    Default is to use:
+
+    * `xlwt <https://pypi.org/project/xlwt/>`__ for xls files
+    * `xlsxwriter <https://pypi.org/project/XlsxWriter/>`__ for xlsx files if xlsxwriter
+      is installed otherwise `openpyxl <https://pypi.org/project/openpyxl/>`__
+    * `odswriter <https://pypi.org/project/odswriter/>`__ for ods files
+
+    See ``DataFrame.to_excel`` for typical usage.
 
     The writer should be used as a context manager. Otherwise, call `close()` to save
     and close any opened file handles.