Commented Task: Update metadata API docs [788]

Some parts of the metadata API surface obtained from the MetadataWorkspace and now used when creating model-based Code First conventions are not well documented. Examples include:

EntityType vs EntitySet vs EntityState - the XML documentation for these is self-referential
EdmMember vs EdmModel vs EdmNamespace vs EdmProperty - the XML documentation for these is self-referential

Comments: Fixed in commit 61e76fc98174