Update content model for select

This needs refinement after accessibility semantics/constraints are
figured out: whatwg#10317

source

@@ -53203,7 +53203,7 @@ interface <dfn interface>HTMLButtonElement</dfn> : <span>HTMLElement</span> {
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>phrasing content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd>Zero or more <code>option</code>, <code>optgroup</code>, <code>hr</code>, and <span data-x="script-supporting elements">script-supporting</span> elements.</dd>
+   <dd><span>phrasing content</span> except <span>interactive content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dd><code data-x="attr-fe-autocomplete">autocomplete</code></dd>