DevTools: NetworkPanel: show link where resource timing is explained.

Source/devtools/front_end/components/helpScreen.css

Index: Source/devtools/front_end/components/helpScreen.css
diff --git a/Source/devtools/front_end/components/helpScreen.css b/Source/devtools/front_end/components/helpScreen.css
index 59c82029c61f839edde71a579288f78a8433078a..6b33337d813910df2ebe759584549a8ebd0dcdc4 100644
--- a/Source/devtools/front_end/components/helpScreen.css
+++ b/Source/devtools/front_end/components/helpScreen.css
@@ -16,10 +16,6 @@
     border-radius: 10px;
 }
 
-.help-window-main a {
-    color: rgb(17, 85, 204);
-}
-
 .help-window-caption {
     border-bottom: solid 1px rgb(153, 153, 153);
     margin: 0 8px;
@@ -645,4 +641,4 @@ select.list-column-editor {
 
 .settings-developer-mode .settings-experiment-hidden {
     display: block;
-}
+}