Fix some broken rst.

Author: drvinceknight

docs/how-to/use_custom_matches.rst

@@ -13,7 +13,9 @@ creates a new class of a match where both players end with a score of 2::
     ...     def final_score_per_turn(self):
     ...         return 2, 2
 
-We can now create a Moran process like we normally would and pass our custom :code:`MassBaseMatch` to the moran process with the :code:`match_class` keyword argument::
+We can now create a Moran process like we normally would and pass our custom
+:code:`MassBaseMatch` to the moran process with the :code:`match_class` keyword
+argument::
 
     >>> players = [axl.Cooperator(), axl.Defector(), axl.TitForTat(), axl.Grudger()]
     >>> mp = axl.MoranProcess(players=players, match_class=MassBaseMatch, seed=0)

docs/tutorials/creating_heterogenous_player_moran_process/index.rst

@@ -32,7 +32,7 @@ modification of individual strategies::
     >>> set_player_mass(players, masses)
 
 The :code:`Match` class can be partially altered to enable different behaviour
-(see :ref:`use-custom-matches`_).
+(see :ref:`use-custom-matches`).
 Here we extend :code:`axl.Match` and overwrite its
 :code:`final_score_per_turn()` function to utilize the player mass attribute as
 a multiplier for the final score::