doc: Fix margins around tables of contents

There is no space between the TOC and the succeeding para.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/doc/rust.css b/src/doc/rust.css
index 3957231a195..b9d585c953c 100644
--- a/src/doc/rust.css
+++ b/src/doc/rust.css
@@ -275,7 +275,7 @@ dd {
 
 nav ul {
     list-style-type: none;
-    margin: 0;
+    margin: 0 0 20px 0;
     padding-left: 0px;
 }