docs(css): Fix word breaks issue in <pre>

Closes angular#6586

Author: Gias Kay Lee

docs/app/assets/css/docs.css

@@ -184,10 +184,12 @@ h1,h2,h3,h4,h5,h6 {
 }
 
 pre {
-  padding:15px;
-  border:1px solid #ddd;
-  display:block;
-  border-radius:5px;
+  padding: 15px;
+  border: 1px solid #ddd;
+  border-radius: 5px;
+  display: block;
+  white-space: pre-wrap;
+  word-break: normal;
 }
 
 .aside-nav a,