Remove more libraries directives from server

pkg/analysis_server/lib/src/utilities/documentation.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library analysis_server.src.utilities.documentation;
-
 String getDartDocSummary(String str) {
   if (str == null) {
     return null;
   }
   List<String> lines = str.split('\n');
   StringBuffer sb = new StringBuffer();
   bool firstLine = true;
   for (String line in lines) {
     if (sb.length != 0 && line.isEmpty) {
       return sb.toString();
@@ skipping 43 matching lines @@
     if (!firstLine) {
       sb.write('\n');
     }
     firstLine = false;
     sb.write(line);
   }
   str = sb.toString();
   // done
   return str;
 }