Add missing entries to staticdocs index

inst/staticdocs/index.r

@@ -45,6 +45,7 @@ sd_section("UI Inputs",
     "submitButton",
     "textInput",
     "passwordInput",
+    "updateActionButton",
     "updateCheckboxGroupInput",
     "updateCheckboxInput",
     "updateDateInput",
@@ -156,6 +157,7 @@ sd_section("Utility functions",
   "Miscellaneous utilities that may be useful to advanced users or when extending Shiny.",
   c(
     "req",
+    "cancelOutput",
     "validate",
     "session",
     "exprToFunction",