Dokka config: try to ignore `org.matrix.android.sdk.internal.legacy.riot`

matrix-sdk-android/build.gradle

@@ -19,6 +19,13 @@ dokkaHtml {
         configureEach {
             // Emit warnings about not documented members.
             reportUndocumented.set(true)
+            // Suppress package legacy riot. Sadly this does not work
+            /*
+            perPackageOption {
+                prefix.set("org.matrix.android.sdk.internal.legacy.riot")
+                suppress.set(true)
+            }
+             */
         }
     }
 }