Fix typo in hw0.ipynb

hw0.ipynb

@@ -203,7 +203,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "As you can see, you will get an error that indicates the line where the assertion failed, which you can then use to go back and debug your implementation.  **You should get comfortabale with reading and tracing through the tests file as a way of better understanding how your implementations should work.**\n",
+    "As you can see, you will get an error that indicates the line where the assertion failed, which you can then use to go back and debug your implementation.  **You should get comfortable with reading and tracing through the tests file as a way of better understanding how your implementations should work.**\n",
     "\n",
     "Learning to properly develop and use unit tests is crucial to modern software development, and hopefully a secondary outcome of this course is that you become familiar with the typical usage of unit tests within software development.  Of course, this isn't entirely true, because you don't necessarily need to _write_ your own tests to pass the questions here, but you _should_ become familiar with how to read the test files that we provide, as a way to understand how your function should behave.  However, we _absolutely_ would also encourage you to write additional tests for your implementations, especially if you find that your code is passing the local tests, but still seems to be failing on submission.\n",
     "\n",