doc: fix paragraph line-height issue

Fix a line-height issue introduced in #15660 where paragraphs
containing <code> blocks would have unequal line heights.

Fixes: nodejs/nodejs.org#1399
PR-URL: #16200
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Yuta Hiroto <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>

Author: silverwind

doc/api_assets/style.css

@@ -211,6 +211,7 @@ abbr {
 p {
   text-rendering: optimizeLegibility;
   margin: 0 0 1.125rem 0;
+  line-height: 1.5;
 }
 
 #apicontent > *:last-child {