bindings/python/doc/conf.py: fix logic to link to Github repository

bindings/python/doc/conf.py

@@ -68,10 +68,10 @@ linkcheck_anchors_ignore = [
 
 source_prefix = 'https://github.com/Microsoft/CNTK/blob/'
 if module_is_unreleased():
-    # TODO temporary
-    source_prefix += 'v%s' % (cntk.__version__[:-1].replace("rc", ".rc"))
-else:
     source_prefix += 'master'
+else:
+    # TODO temporary
+    source_prefix += 'v%s' % (cntk.__version__.replace("rc", ".rc"))
 
 # sphinx.ext.extlinks options
 extlinks = {