Uniprot legacy comment update (#725)

* correct Within calculation

* update unit tests

* this is the spot

* add space

* comment update UniProt URL where column names for downloads can be found

---------

Co-authored-by: MICHAEL SHORTREED <mrshortreed@wisc.edu>
Co-authored-by: Anthony <anthony.cesnik@gmail.com>

mzLib/UsefulProteomicsDatabases/ProteinDbRetriever.cs

@@ -239,7 +239,7 @@ public enum IncludeIsoforms
 
         /// <summary>
         /// Columns to select for retrieving results in tab or xls format.
-        /// https://legacy.uniprot.org/help/uniprotkb_column_names
+        /// https://www.uniprot.org/help/return_fields
         /// </summary>
         public enum Columns
         {