Deprecate option "enableNullAwareOperators" in analysis server.

pkg/analysis_server/tool/spec/spec_input.html

Index: pkg/analysis_server/tool/spec/spec_input.html
diff --git a/pkg/analysis_server/tool/spec/spec_input.html b/pkg/analysis_server/tool/spec/spec_input.html
index 57d679280fe4b13937b72ebfda68732a5ef06062..23e13e418f326326427b50b2a0f73896e7f2de0a 100644
--- a/pkg/analysis_server/tool/spec/spec_input.html
+++ b/pkg/analysis_server/tool/spec/spec_input.html
@@ -1988,7 +1988,7 @@
         <object>
           <field name="enableAsync" optional="true">
             <ref>bool</ref>
-            <p><b><i>Deprecated</i></b></p>
+            <p><b><i>Deprecated</i></b>: this feature is always enabled.</p>
             <p>
               True if the client wants to enable support for the
               proposed async feature.
@@ -1996,7 +1996,7 @@
           </field>
           <field name="enableDeferredLoading" optional="true">
             <ref>bool</ref>
-            <p><b><i>Deprecated</i></b></p>
+            <p><b><i>Deprecated</i></b>: this feature is always enabled.</p>
             <p>
               True if the client wants to enable support for the
               proposed deferred loading feature.
@@ -2004,7 +2004,7 @@
           </field>
           <field name="enableEnums" optional="true">
             <ref>bool</ref>
-            <p><b><i>Deprecated</i></b></p>
+            <p><b><i>Deprecated</i></b>: this feature is always enabled.</p>
             <p>
               True if the client wants to enable support for the
               proposed enum feature.
@@ -2012,6 +2012,7 @@
           </field>
           <field name="enableNullAwareOperators" optional="true">
             <ref>bool</ref>
+            <p><b><i>Deprecated</i></b>: this feature is always enabled.</p>
             <p>
               True if the client wants to enable support for the
               proposed "null aware operators" feature.