adding link to help page for advanced search
<span id="search-clear" v-b-tooltip.hover title="Clear all selections and search again" style="cursor:pointer"
v-on:click="clearSearch" class="fa fa-times-circle inside-right interactive"></span>
<span id="search-glass" class="fa fa-search inside-left"></span>
+ <a href="https://help.hydroshare.org/discovering-resources/discovering-data-and-models-from-hydroshare-users/field-based-search-in-discover/" target="_blank">Advanced search help</a>
<p class="table-message" v-if="noMatches()">No resource matches</p>
</div>
</div>
