Minor change to text based on issue comments

Author: larsbarring

vocabularies.md

@@ -212,6 +212,7 @@ group: "navigation"
     List of<a href="Data/cf-standard-names/docs/standard-name-contributors.html"> contributors</a> to CF Standard Names<br>
     <a href="standard_name_rules.html">Rules</a> for making changes to the CF vocabularies
     <a href="Data/schema-files/cf-standard-name-table-2.0.xsd">Schema file</a> for the Standard name table XML files (version 1 -- current)
+    <a href="Data/schema-files/cf-standard-name-table-2.0.xsd">Schema file</a> for all versions of the Standard name table XML files
 
   <h5><b>Discussion</b></h5>