Fix text on a couple of tooltips.

Author: Tim Sowers

src/main/resources/templates/tooltips/AwardDOI.mustache

@@ -1,6 +1,6 @@
 <span class="tooltip-item" data-toggle="tooltip">
     <span class="tooltip-content" style="display:none">
-        <div>The Award Digital Object Identifier (DOI) under which work or time was provided.  DOIs follow the format: 10.XXXX/XXXXX</div>
+        <div>The Award Digital Object Identifier (DOI) under which work or time was provided. DOIs follow the format: 10.XXXX/XXXXX</div>
     </span>
     <span class="fa fa-question-circle help-question-mark"></span>
 </span>

src/main/resources/templates/tooltips/Identifier.mustache

@@ -1,4 +1,4 @@
 <span class="tooltip-item" data-toggle="tooltip">
-     <span class="tooltip-content" style="display:none">Provide the Digital Object Identifier (DOI) or URL for the related item(s).</span>
+     <span class="tooltip-content" style="display:none">Provide the Digital Object Identifier (DOI) or URL for the related item.</span>
      <span class="fa fa-question-circle help-question-mark"></span>
 </span>