Update comment

src/score/calculator.rs

@@ -14,8 +14,7 @@ pub struct TermData<'a> {
     // Current expanded term from the expanded terms generated
     // from the current query term `query_term`
     pub query_term_expanded: &'a str,
-
-    // All available query terms
+    // Total number of query terms present in the query this TermData was created from
     pub query_terms_len: usize
 }