[discrete_dp] Adjust Figure Sizes (#37)

Co-authored-by: mmcky <mmcky@users.noreply.github.com>

Author: shlff

lectures/discrete_dp.md

@@ -555,7 +555,7 @@ results.mc.stationary_distributions
 Here's the same information in a bar graph
 
 ```{figure} /_static/lecture_specific/discrete_dp/finite_dp_simple_og.png
-:scale: 90
+:scale: 70%
 ```
 
 What happens if the agent is more patient?
@@ -569,7 +569,7 @@ results.mc.stationary_distributions
 If we look at the bar graph we can see the rightward shift in probability mass
 
 ```{figure} /_static/lecture_specific/discrete_dp/finite_dp_simple_og2.png
-:scale: 90
+:scale: 70%
 ```
 
 ### State-Action Pair Formulation