Remove todo not on o-form demo markup.

It may be an issue if `o-forms` decides to style an `input` with
`.o-forms-input--select` or a `select` with `.o-forms-input--text`.
We don't think this is likely to be a problem and may be caught
with visual regression testing.

demos/src/static/static.mustache

@@ -4,7 +4,6 @@
     </span>
     {{! o-forms styles for select input needed for the core experience }}
     {{! o-forms styles for text input needed for the enhances JS experience }}
-    {{! todo: document this as a valid/supported usecase of o-forms? make autocomplete depend on o-forms and toggle? }}
     <span class="o-forms-input o-forms-input--text o-forms-input--select">
         <div data-o-component="o-autocomplete" class="o-autocomplete">
             <select id="my-autocomplete">