Rollup merge of #79985 - GuillaumeGomez:fix-submit-event, r=jyn514

Fixes submit event of the search input

Fixes #79960

It's a very funny corner case:

In HTML, when a button follows an input (in a `form`), if the enter keep is pressed on the input, instead of sending the submit event to the input, it'll create a click event on the button following it, which in this case made the help popup show up whenever "enter" was pressed.

cc `@camelid`

r? `@jyn514`

src/librustdoc/html/layout.rs

@@ -98,7 +98,7 @@ crate fn render<T: Print, S: Print>(
                            placeholder=\"Click or press ‘S’ to search, ‘?’ for more options…\" \
                            type=\"search\">\
                 </div>\
-                <button class=\"help-button\">?</button>
+                <button type=\"button\" class=\"help-button\">?</button>
                 <a id=\"settings-menu\" href=\"{root_path}settings.html\">\
                     <img src=\"{static_root_path}wheel{suffix}.svg\" \
                          width=\"18\" \