Rollup merge of rust-lang#111674 - GuillaumeGomez:add-missing-backsla…

…sh, r=notriddle

Add missing backslash in HTML string

Found this missing one when looking at code.

r? `@notriddle`

src/librustdoc/html/render/mod.rs

@@ -1751,7 +1751,7 @@ fn render_impl(
             if trait_.is_none() && i.inner_impl().items.is_empty() {
                 w.write_str(
                     "<div class=\"item-info\">\
-                    <div class=\"stab empty-impl\">This impl block contains no items.</div>
+                    <div class=\"stab empty-impl\">This impl block contains no items.</div>\
                 </div>",
                 );
             }