docs/llvm.css: Introduce <blockquote><pre>. It may be used as blockquoted "doc_code".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137432 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/llvm.css b/docs/llvm.css
index 1222cf1..e3e6351 100644
--- a/docs/llvm.css
+++ b/docs/llvm.css
@@ -70,6 +70,14 @@
                   display: table;
                 }
 
+blockquote pre {
+        padding: 1em 2em 1em 1em;
+        border: solid 1px gray;
+        background: #eeeeee;
+        margin: 0 1em 0 1em;
+        display: table;
+}
+
 h2+div, h2+p {text-align: left; padding-left: 20pt; padding-right: 10pt;}
 h3+div, h3+p {text-align: left; padding-left: 20pt; padding-right: 10pt;}
 h4+div, h4+p {text-align: left; padding-left: 20pt; padding-right: 10pt;}