[harrison_kreps] Fix tables

Author: mmcky

lectures/harrison_kreps.md

@@ -233,57 +233,14 @@ It records implications of Harrison and Kreps's specifications of $P_a, P_b, \be
 ```{raw} html
 <div class="content-table"></div>
 ```
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-|$|s_t|$|0|1|
+|$ s_t $|0|1|
 |:---------------------:|:----:|:----:|
-|$|p_a|$|1.33|1.22|
-|$|p_b|$|1.45|1.91|
-|$|p_o|$|1.85|2.08|
-|$|p_p|$|1|1|
-|$|\hat{p}_a|$|1.85|1.69|
-|$|\hat{p}_b|$|1.69|2.08|
+|$ p_a $|1.33|1.22|
+|$ p_b $|1.45|1.91|
+|$ p_o $|1.85|2.08|
+|$ p_p $|1|1|
+|$ \hat{p}_a $|1.85|1.69|
+|$ \hat{p}_b $|1.69|2.08|
 
 Here