#3080 fixed text style for cnas added by year header

Author: jdaigneau5

src/views/About/Metrics.vue

@@ -240,8 +240,10 @@
               <div class="cve-scrollx-table-container">
                 <table class="table is-striped is-hoverable cve-border-dark-blue">
                   <thead>
-                    <th>Year</th>
-                    <th v-for="year in cnasAddedByYear.years" :key="year">{{year}}</th>
+                    <tr>
+                      <th>Year</th>
+                      <th v-for="year in cnasAddedByYear.years" :key="year">{{year}}</th>
+                    </tr>
                   </thead>
                   <tbody>
                     <tr v-for="month in [ 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October',