Remove bolding on associated constants

Associated types don't get bolded, so it looks off to have one kind
bolded and one not.

src/librustdoc/html/render/mod.rs

@@ -753,7 +753,7 @@ fn assoc_const(
 ) {
     write!(
         w,
-        "{}{}const <a href=\"{}\" class=\"constant\"><b>{}</b></a>: {}",
+        "{}{}const <a href=\"{}\" class=\"constant\">{}</a>: {}",
         extra,
         it.visibility.print_with_space(it.def_id, cx),
         naive_assoc_href(it, link, cx),

src/test/rustdoc-gui/font-weight.goml

@@ -13,6 +13,21 @@ goto: file://|DOC_PATH|/test_docs/struct.Foo.html
 assert-css: (".impl-items .method", {"font-weight": "600"}, ALL)
 
 goto: file://|DOC_PATH|/lib2/trait.Trait.html
+
+// This is a complex selector, so here's how it works:
+//
+// * //*[@class='docblock type-decl'] — selects element of any tag with classes docblock and type-decl
+// * /pre[@class='rust trait'] — selects immediate child with tag pre and classes rust and trait
+// * /code — selects immediate child with tag code
+// * /a[@class='constant'] — selects immediate child with tag a and class constant
+// * //text() — selects child that is text node
+// * /parent::* — selects immediate parent of the text node (the * means it can be any tag)
+//
+// This uses '/parent::*' as a proxy for the style of the text node.
+// We can't just select the '<a>' because intermediate tags could be added.
+assert-count: ("//*[@class='docblock type-decl']/pre[@class='rust trait']/code/a[@class='constant']//text()/parent::*", 1)
+assert-css: ("//*[@class='docblock type-decl']/pre[@class='rust trait']/code/a[@class='constant']//text()/parent::*", {"font-weight": "400"})
+
 assert-count: (".methods .type", 1)
 assert-css: (".methods .type", {"font-weight": "600"})
 assert-count: (".methods .constant", 1)