Fix typo

Author: zacharyaanglin

tutorials/Introduction to Modeling in Gen.ipynb

@@ -233,7 +233,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "More interesting than `n` are the values of the random choies that `line_model` makes. **Crucially, each random choice is annotated with a unique *address*.** A random choice is assigned an address using the `@trace` keyword. Addresses can be any Julia value. In this program, there are two types of addresses used -- Julia symbols and tuples of symbols and integers. Note that within the `for` loop, the same line of code is executed multiple times, but each time, the random choice it makes is given a distinct address."
+    "More interesting than `n` are the values of the random choices that `line_model` makes. **Crucially, each random choice is annotated with a unique *address*.** A random choice is assigned an address using the `@trace` keyword. Addresses can be any Julia value. In this program, there are two types of addresses used -- Julia symbols and tuples of symbols and integers. Note that within the `for` loop, the same line of code is executed multiple times, but each time, the random choice it makes is given a distinct address."
    ]
   },
   {