complete the docs scss toc

docs/assets/scss/docs.scss

@@ -42,10 +42,33 @@ $bd-info:         #5bc0de;
 //
 // Key sections to this file.
 
-// - Scaffolding
-// - Buttons
-// - Booticon
-// - Main navigation
+// Scaffolding
+// Buttons
+// Booticon
+// Main navigation
+// Footer
+// Social buttons
+// Homepage
+// Masthead
+// Page headers
+// Carbon ads
+// Homepage featurettes
+// Featured Expo sites
+// Examples
+// Custom container
+// Side navigation
+// Docs sections
+// Callouts
+// Color swatches
+// Team members
+// Wall of Browser Bugs
+// Grid examples
+// Docs examples
+// Code snippets
+// Responsive tests
+// Brand guidelines
+// ZeroClipboard styles
+// Miscellaneous
 
 
 // Scaffolding
@@ -252,7 +275,11 @@ body {
   }
 }
 
+
+//
 // Masthead (headings and download button)
+//
+
 .bd-masthead {
   position: relative;
   padding: 2rem 0;
@@ -1417,6 +1444,7 @@ body {
   }
 }
 
+
 //
 // Brand guidelines
 //