Tom October Updates (#173)

* Tom's edits of two calvo lectures in a branch

* Tom's Oct 9 edits of calvo_abreu lecture

* Tom's second Oct 9 edits of calvo_abreu lecture

* Tom's Oct 12 edits of calvo_abreu lecture

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Co-authored-by: thomassargent30 <[email protected]>

Author: mmcky

lectures/_toc.yml

@@ -67,6 +67,7 @@ parts:
   - file: dyn_stack
   - file: calvo_machine_learn
   - file: calvo
+  - file: calvo_abreu 
   - file: opt_tax_recur
   - file: amss
   - file: amss2