docs: Fix math mode syntax in contrib.viz.brazil.plot_results docstri…

…ng (#1243)

* Use correct Sphinx math mode syntax for contrib.viz.brazil.plot_results docstring

src/pyhf/contrib/viz/brazil.py

@@ -30,9 +30,9 @@ def plot_results(ax, mutests, tests, test_size=0.05):
         ax (`matplotlib.axes.Axes`): The matplotlib axis object to plot on.
         mutests (:obj:`list` or :obj:`array`): The values of the POI where the
           hypothesis tests were performed.
-        tests (:obj:`list` or :obj:`array`): The :math:$\\mathrm{CL}_{s}$ values
+        tests (:obj:`list` or :obj:`array`): The :math:`\\mathrm{CL}_{s}` values
           from the hypothesis tests.
-        test_size (:obj:`float`): The size, :math:$\alpha$, of the test.
+        test_size (:obj:`float`): The size, :math:`\\alpha`, of the test.
     """
     cls_obs = np.array([test[0] for test in tests]).flatten()
     cls_exp = [np.array([test[1][i] for test in tests]).flatten() for i in range(5)]