Update 404.rst

Author: linawolf

Documentation/404.rst

@@ -14,9 +14,9 @@ box on the top of the page.
 
 Or pick one of the following:
 
-* `Core Documentation :doc:`Core documentation <h2document:Basics/BasicPrinciples#core-documentation>``__
-* `Third-party extensions :doc:`Third-party extensions <h2document:Basics/BasicPrinciples#third-party-extensions>``__
-* `System extensions :doc:`System extensions <h2document:Basics/BasicPrinciples#system-extensions>``__
+* :doc:`Core documentation <h2document:Basics/BasicPrinciples#core-documentation>`__
+* :doc:`Third-party extensions <h2document:Basics/BasicPrinciples#third-party-extensions>`__
+* :doc:`System extensions <h2document:Basics/BasicPrinciples#system-extensions>`__
 
 
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