rustdoc: fix tooltip position of code examples inside warning blocks

The tooltip of an `ignore`/`compile_fail`/`should_panic`/edition example
is placed 25px to the left of the code block. Inside a `.warning` block
that lands on top of the warning's own left border.

src/librustdoc/html/static/css/rustdoc.css

@@ -1818,6 +1818,12 @@ documentation. */
 .top-doc > .docblock >.warning:first-child::before {
 	top: 20px;
 }
+.content .docblock .warning .example-wrap.compile_fail,
+.content .docblock .warning .example-wrap.should_panic,
+.content .docblock .warning .example-wrap.ignore,
+.content .docblock .warning .example-wrap.edition {
+	margin-left: 25px;
+}
 
 .example-wrap > a.test-arrow, .example-wrap .button-holder {
 	visibility: hidden;