Update plugin spec to match server spec changes

pkg/analyzer_plugin/tool/spec/plugin_spec.html

Index: pkg/analyzer_plugin/tool/spec/plugin_spec.html
diff --git a/pkg/analyzer_plugin/tool/spec/plugin_spec.html b/pkg/analyzer_plugin/tool/spec/plugin_spec.html
index 119e41d63036f306ddbc588c73d06be2adc2a4ae..6f48ae8197004951a8cfaf77f723350c6e55a78e 100644
--- a/pkg/analyzer_plugin/tool/spec/plugin_spec.html
+++ b/pkg/analyzer_plugin/tool/spec/plugin_spec.html
@@ -1038,6 +1038,25 @@
           omitted if the suggested element is not a member of a class.
         </p>
       </field>
+      <field name="defaultArgumentListString" optional="true">
+        <ref>String</ref>
+        <p>
+          A default String for use in generating argument list source contents
+          on the client side.
+        </p>
+      </field>
+      <field name="defaultArgumentListTextRanges" optional="true">
+        <list><ref>int</ref></list>
+        <p>
+          Pairs of offsets and lengths describing 'defaultArgumentListString'
+          text ranges suitable for use by clients to set up linked edits of
+          default argument source contents. For example, given an argument list
+          string 'x, y', the corresponding text range [0, 1, 3, 1], indicates
+          two text ranges of length 1, starting at offsets 0 and 3. Clients can
+          use these ranges to treat the 'x' and 'y' values specially for linked
+          edits.
+        </p>
+      </field>
       <field name="element" optional="true">
         <ref>Element</ref>
         <p>