GUI - backslash '\' now toggles quick help in addition to slash '/'

Change-Id: Ibb2485215eb9fab63d45e106519166593a06da25
diff --git a/web/gui/src/main/webapp/onosQuickHelp.js b/web/gui/src/main/webapp/onosQuickHelp.js
index 2cc2a18..28c488b 100644
--- a/web/gui/src/main/webapp/onosQuickHelp.js
+++ b/web/gui/src/main/webapp/onosQuickHelp.js
@@ -55,6 +55,7 @@
         equals: '=',
         dash: '-',
         slash: '/',
+        backSlash: '\\',
         backQuote: '`',
         leftArrow: 'L-arrow',
         upArrow: 'U-arrow',