Adding in-depth documentation link <temporary>

doc/documentation.rst

@@ -2,4 +2,4 @@
 Documentation
 =============
 
-In-depth documentation can be found at `Apiary <https://baseballstatscz.docs.apiary.io/>`page.
+In-depth documentation can be found at `Apiary<https://baseballstatscz.docs.apiary.io/>`_ page.