Small scrape-example fixes

Author: willcrichton

src/doc/rustdoc/src/unstable-features.md

@@ -462,7 +462,7 @@ This option, combined with `--scrape-examples-target-crate` and `--scrape-exampl
 
 ```bash
 $ rustdoc examples/ex.rs -Z unstable-options \
-    --extern foobar=target/deps/libfoobar.rmeta
+    --extern foobar=target/deps/libfoobar.rmeta \
     --scrape-examples-target-crate foobar \
     --scrape-examples-output-path output.calls
 $ rustdoc src/lib.rs -Z unstable-options --with-examples output.calls

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

@@ -453,11 +453,16 @@ nav.sub {
 	text-decoration: underline;
 }
 
-.rustdoc:not(.source) .example-wrap > pre:not(.line-numbers) {
+.rustdoc:not(.source) .example-wrap > pre:not(.line-number) {
 	width: 100%;
 	overflow-x: auto;
 }
 
+.rustdoc:not(.source) .example-wrap > pre.line-numbers {
+	width: auto;
+	overflow-x: visible;
+}
+
 .rustdoc .example-wrap > pre {
 	margin: 0;
 }