Adds docs to HOTG_ADDITIONAL_INSTANCE_TYPES
Adds docs to HOTG_ADDITIONAL_INSTANCE_TYPES

stvstnfrd/configuration,stvstnfrd/configuration,stvstnfrd/configuration,arbrandes/edx-configuration,edx/configuration,edx/configuration,EDUlib/configuration,arbrandes/edx-configuration,appsembler/configuration,edx/configuration,EDUlib/configuration,mitodl/configuration,mitodl/configuration,stvstnfrd/configuration,stvstnfrd/configuration,appsembler/configuration,mitodl/configuration,appsembler/configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,EDUlib/configuration,mitodl/configuration,appsembler/configuration,EDUlib/configuration,EDUlib/configuration,edx/configuration