Ensure that --html-after-content option is used to check scrape_examples_ice rustdoc GUI test

Author: GuillaumeGomez

tests/rustdoc-gui/scrape-examples-ice-links.goml

@@ -4,3 +4,5 @@ wait-for: ".scraped-example-title"
 assert-attribute: (".scraped-example-title a", {"href": "../src/bar/bar.rs.html#2"})
 click: ".scraped-example-title a"
 wait-for-property: ("h1", {"innerText": "bar/\nbar.rs"})
+// Ensure that the `--html-after-content` option was correctly handled.
+assert: "#outer-html"

tests/rustdoc-gui/src/scrape_examples_ice/empty.html

@@ -0,0 +1 @@
+<span id="outer-html"></span>

tests/rustdoc-gui/src/scrape_examples_ice/extra.html

@@ -1,5 +1,5 @@
 //@ run-flags:-Zrustdoc-scrape-examples
-//@ compile-flags: --html-after-content empty.html
+//@ compile-flags: --html-after-content extra.html
 pub struct ObscurelyNamedType1;
 
 impl ObscurelyNamedType1 {