Fix todo

content/blog/00_cs325_languages_hw1.md

@@ -329,7 +329,9 @@ and uses the cache otherwise. We choose this route.
 variables above a given variable before evaluating the variable
 itself. So, each function will first call (and therefore
 {{< sidenote "right" "force-note" "force" >}}
-{{< todo >}}Explain forcing{{< /todo >}}
+Forcing, in this case, comes from the context of lazy evaluation. To
+force a variable or an expression is to tell the program to compute its
+value, even though it may have been putting it off.
 {{< /sidenote >}}) the functions
 generated for variables declared above the function's own variable.
 5. To keep track of all of this, we use the already-existing state monad