Update docs/notebooks/How_JAX_primitives_work.ipynb

Co-Authored-By: James Bradbury <jekbradbury@google.com>

Author: gnecula

docs/notebooks/How_JAX_primitives_work.ipynb

@@ -305,7 +305,7 @@
       "source": [
         "## Defining new JAX primitives\n",
         "\n",
-        "The right way to add support for multiple-add is in terms of existing\n",
+        "The right way to add support for multiply-add is in terms of existing\n",
         "JAX primitives, as shown above. However, in order to demonstrate how JAX\n",
         "primitives work let us pretend that we want to add a new primitive to \n",
         "JAX for the multiply-add functionality."