Fix a silly keybinding syntax issue

There was an issue with the syntax definition on key bindings in which
we thought it was not correctly scoping the < character. It turns out
that it was actually not correctly scopingthe > character instead.

This fixes that, although it now makes both < and > highlight differently
than the key binding itself.

It is, at least, consistent now.

resources/syntax/HyperHelp-Help.sublime-syntax

@@ -58,6 +58,7 @@ contexts:
       push:
         - meta_scope: variable.language meta.keybind
         - match: '>(?=[^>])'
+          scope: punctuation.definition.keybind.end.help
           pop: true
   inline-code-block:
     - match: '`'