use md-typography for note content

app/assets/stylesheets/gitlab_bootstrap/mixins.scss

@@ -75,3 +75,14 @@
   line-height: 36px;
   font-weight: normal;
 }
+
+@mixin md-typography {
+  code { padding: 0 4px; }
+  p { font-size: 13px; }
+  h1 { font-size: 26px; line-height: 40px; margin: 10px 0;}
+  h2 { font-size: 22px; line-height: 40px; margin: 10px 0;}
+  h3 { font-size: 18px; line-height: 40px; margin: 10px 0;}
+  h4 { font-size: 16px; line-height: 20px; margin: 10px 0;}
+  h5 { font-size: 14px; line-height: 20px; margin: 10px 0;}
+  h6 { font-size: 12px; line-height: 20px; margin: 10px 0;}
+}

app/assets/stylesheets/gitlab_bootstrap/typography.scss

@@ -87,17 +87,11 @@ a:focus {
  *
  */
 .wiki {
+  @include md-typography;
+
   font-size: 13px;
   line-height: 20px;
 
-  code { padding: 0 4px; }
-  p { font-size: 13px; }
-  h1 { font-size: 26px; line-height: 40px; margin: 10px 0;}
-  h2 { font-size: 22px; line-height: 40px; margin: 10px 0;}
-  h3 { font-size: 18px; line-height: 40px; margin: 10px 0;}
-  h4 { font-size: 16px; line-height: 20px; margin: 10px 0;}
-  h5 { font-size: 14px; line-height: 20px; margin: 10px 0;}
-  h6 { font-size: 12px; line-height: 20px; margin: 10px 0;}
   .white .highlight pre { background: #f5f5f5; }
   ul { margin: 0 0 9px 25px !important; }
 }

app/assets/stylesheets/sections/notes.scss

@@ -83,6 +83,7 @@ ul.notes {
       margin-top: -20px;
     }
     .note-body {
+      @include md-typography;
       margin-left: 45px;
     }
     .note-header {