Revise modelchain.rst for multiple arrays, results attribute (#1223)

* revise for new run_model methods, .results attribute, multiple arrays

* fix typos, use bullets instead of table

* improvements, add with_ class methods

* fix mistake

* fix another mistake

* fix cross reference

* updates from review

* more use of formatting

* fix link

* refix link

* clear up deprecations

* a few more, print inverter model inference helpers

* correct references

* revisions from review

* fix up loop in pvusa_mc_wrapper

* indents

* correct references

* thrash some more

* suppress long output

* add comments to user function example

* add :

* spacing

* move comments to docstring so they appear in rtd

* improvements from review

* last edits

* spelling

* remove unneeded unwrap in example function

Author: cwhanse

docs/sphinx/source/api.rst

@@ -572,6 +572,8 @@ Creating a ModelChain object.
    modelchain.ModelChain.with_pvwatts
    modelchain.ModelChain.with_sapm
 
+.. _modelchain_runmodel:
+
 Running
 -------
 

docs/sphinx/source/introtutorial.rst

@@ -209,8 +209,8 @@ by examining the parameters defined for the module.
         )
 
         mc = ModelChain(system, location)
-        results = mc.run_model(weather)
-        annual_energy = results.ac.sum()
+        mc.run_model(weather)
+        annual_energy = mc.results.ac.sum()
         energies[name] = annual_energy
 
     energies = pd.Series(energies)