Update HTML DOM attribute "edition" to "data-edition"

Author: GuillaumeGomez

src/librustdoc/html/highlight.rs

@@ -30,7 +30,7 @@ crate fn render_with_highlighting(
             "<div class='information'><div class='tooltip {}'{}>ⓘ</div></div>",
             class,
             if let Some(edition_info) = edition_info {
-                format!(" edition=\"{}\"", edition_info)
+                format!(" data-edition=\"{}\"", edition_info)
             } else {
                 String::new()
             },

src/librustdoc/html/static/rustdoc.css

@@ -1098,7 +1098,7 @@ h3 > .collapse-toggle, h4 > .collapse-toggle {
 	content: "This example panics";
 }
 .tooltip.edition::after {
-	content: "This code runs with edition " attr(edition);
+	content: "This code runs with edition " attr(data-edition);
 }
 
 .tooltip::before {

src/test/rustdoc/codeblock-title.rs

@@ -3,7 +3,7 @@
 // @has foo/fn.bar.html '//*[@class="tooltip compile_fail"]' "ⓘ"
 // @has foo/fn.bar.html '//*[@class="tooltip ignore"]' "ⓘ"
 // @has foo/fn.bar.html '//*[@class="tooltip should_panic"]' "ⓘ"
-// @has foo/fn.bar.html '//*[@edition="2018"]' "ⓘ"
+// @has foo/fn.bar.html '//*[@data-edition="2018"]' "ⓘ"
 
 /// foo
 ///