[Doc] Add note about specifying species in the stoichiometric_solid example in phases.rst
[Doc] Add note about specifying species in the stoichiometric_solid example in phases.rst

Patch provided by Bryan Weber. See Issue 196.

git-svn-id: e76dbe14710aecee1ad27675521492cea2578c83@2634 02a645c2-efd0-11dd-984d-ab748d24aa7e

Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn