Fix broken image reference

Author: RyanDavies19

example/MoorDyn_standalone_demo.ipynb

@@ -51,7 +51,7 @@
     "\n",
     "For the first example, we will be simulating three catenary chain moorings on a floating wind turbine platform with no water kinematics \\(waves and currents\\). This is the mooring system of the OC3 Hywind Spar from [Jonkman 2010](https://www.nrel.gov/docs/fy10osti/47535.pdf) shown below.\n",
     "\n",
-    "<img src=\"OC3_mooring.png\" alt=\"OC3 Spar Mooring\" width=\"400\">\n",
+    "<img src=\"jonkman_2010_3-1.png\" alt=\"OC3 Spar Mooring\" width=\"400\">\n",
     "\n",
     "These three mooring lines are attached to the platform at 70 m below the waterline and 5.2 m from the platform center, this location is known as the fairlead (represented as a MoorDyn point object). \n",
     "We will run this simulation by telling MoorDyn how each fairlead is moving, and MoorDyn will output to our driver the forces at each fairlead. MoorDyn will also\n",