fixed typo

Author: slambits182

part-3.ipynb

@@ -336,7 +336,7 @@
      "source": [
       "Modules are used to make a programmer's life easier. A module is used to group functions, variables, and other things together in an understandable bundle.\n",
       "\n",
-      "Python comes with lots of modules built-in.  For example there's a random module for generating randomnes.  Let's import it so we can use some of its functions:"
+      "Python comes with lots of modules built-in.  For example there's a random module for generating random numbers.  Let's import it so we can use some of its functions:"
      ]
     },
     {