Fix typo in documentation navbar.
Additional fix for
RELNOTES:  None.
@@ -11,7 +11,7 @@ nav: docs
{% assign major_version = "master" %}
{% assign minor_version = "master" %}
{% else % }
-{% assign minor_version = version_components[0] | plus:0 %}
+{% assign major_version = version_components[0] | plus:0 %}
{% assign minor_version = version_components[1] | plus:0 %}
{% endif %}
