added the notebooks for BHBH, massive remannts, and solar system to the docs

docs/source/example_notebooks.rst

@@ -13,7 +13,11 @@ The order of the notebooks below is more or less the recommended order to read.
     notebook_population.ipynb
     notebook_extra_features.ipynb
     notebook_api_functionality.ipynb
+
     notebook_luminosity_function_single.ipynb
     notebook_luminosity_function_binaries.ipynb
     notebook_HRD.ipynb
-    notebook_common_envelope_evolution.ipynb
\ No newline at end of file
+    notebook_common_envelope_evolution.ipynb
+    notebook_BHBH.ipynb
+    notebook_massive_remnants.ipynb
+    notebook_solar_system.ipynb
\ No newline at end of file