rfc48: distinguish github organization/projects

Problem: the governance doc discussed "the project", which
could be confusing since "the project" is really a github organization
that contains several github projects, that may have different
maintainers.

Add a sentence to the Project Governance intro to make this explicit.

Author: garlick

spec_48.rst

@@ -40,6 +40,9 @@ The goal of this governance document is to clearly define the roles, responsibil
 Project Governance
 ******************
 
+The "project" refers to the flux-framework GitHub organization and all the
+GitHub projects hosted within it.
+
 The development and community management of the project will follow the governance rules described in this document.
 
 Project Maintainers