rustdoc: Adjusted style for unstable feature-name

Author: m4rw3r

src/librustdoc/html/static/main.css

@@ -123,7 +123,7 @@ code, pre {
     font-family: "Source Code Pro", Menlo, Monaco, Consolas, "DejaVu Sans Mono", Inconsolata, monospace;
     white-space: pre-wrap;
 }
-.docblock code, .stability code {
+.docblock code {
     background-color: #F5F5F5;
     border-radius: 3px;
     padding: 0 0.2em;
@@ -355,6 +355,10 @@ nav.sub {
     margin-left: 20px;
 }
 
+.content .stability code {
+	font-size: 90%;
+}
+
 nav {
     border-bottom: 1px solid #e0e0e0;
     padding-bottom: 10px;