[doc] Remove trailing whitespace

Signed-off-by: Philipp Wagner <phw@lowrisc.org>
diff --git a/site/docs/assets/scss/_markdown.scss b/site/docs/assets/scss/_markdown.scss
index 65f93cf..79254a8 100644
--- a/site/docs/assets/scss/_markdown.scss
+++ b/site/docs/assets/scss/_markdown.scss
@@ -24,7 +24,7 @@
       padding-top: 0;
     }
   }
-  
+
   h1.title {
     font-size: 2.5em;
     border: none !important;