Fix typo and extend code comments

Author: vladimir-litvinchik

Examples/developer-guide/converting-documents/convert-document-to-another-format/specify_output_format.py

@@ -5,9 +5,9 @@
 def specify_output_format():
     # Instantiate Converter with the input document 
     with Converter("./business-plan.docx") as converter:
-        # Instantiate convert options to define the output format
+        # Instantiate convert options to define the output format, by default it is DOCX
         word_convert_options = WordProcessingConvertOptions()
-        # Set the output fomormat to TXT
+        # Change the output format within the format family from DOCX to TXT
         word_convert_options.format = WordProcessingFileType.TXT
 
         # Convert the input document to TXT