Fix protocol for EXTRACT_LOCAL_VARIABLE and coveringExpressionOffsets/lengths.

pkg/analysis_server/doc/api.html

Index: pkg/analysis_server/doc/api.html
diff --git a/pkg/analysis_server/doc/api.html b/pkg/analysis_server/doc/api.html
index 707246a6bdf417b1301aebbdda814c24ba41cfcb..60cd39ef45f78d8822c18f3edde32ad6625f636b 100644
--- a/pkg/analysis_server/doc/api.html
+++ b/pkg/analysis_server/doc/api.html
@@ -3964,13 +3964,13 @@ dt.typeDefinition {
         </p>
         
         
-      <h4>Feedback</h4><dl><dt class="field"><b><i>coveringExpressionOffsets ( List&lt;int&gt; )</i></b></dt><dd>
+      <h4>Feedback</h4><dl><dt class="field"><b><i>coveringExpressionOffsets ( <span style="color:#999999">optional</span> List&lt;int&gt; )</i></b></dt><dd>
             
             <p>
               The offsets of the expressions that cover the specified
               selection, from the down most to the up most.
             </p>
-          </dd><dt class="field"><b><i>coveringExpressionLengths ( List&lt;int&gt; )</i></b></dt><dd>
+          </dd><dt class="field"><b><i>coveringExpressionLengths ( <span style="color:#999999">optional</span> List&lt;int&gt; )</i></b></dt><dd>
             
             <p>
               The lengths of the expressions that cover the specified