Fix documentation warnings

docs/source/interfaces/muon_grouping_tab.rst

@@ -38,7 +38,7 @@ Pairing Table
 **Guess Alpha** Estimates the alpha for the current pair and recalculates.
 
 Multi-Period Data
-^^^^^^^^^^^^^
+^^^^^^^^^^^^^^^^^^^
 
 For multi period data, the summed and subratcted periods are specfied at the bottom of the tab. These periods will be used for all 
 the groups and pairs.

docs/source/interfaces/muon_sequential_fitting_tab.rst

 .. _muon_sequential_fitting_tab-ref:
 
 Sequential Fitting Tab
------------
+------------------------
 
 .. image::  ../images/muon_interface_tab_sequential_fitting.png
    :align: right