Improve description of supported repository types

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/repo/config/__init__.py

@@ -7,10 +7,10 @@
 Frequenz, defined in
 [`freq.repo.config.RepositoryType`][freq.repo.config.RepositoryType].
 
-- APIs (api)
-- Actors (actor)
-- Applications (app)
-- Libraries (lib)
+- actor: SDK actors
+- api: gRPC APIs
+- app: SDK applications
+- lib: General purpose Python libraries
 
 # Common
 

src/frequenz/repo/config/_core.py

@@ -10,13 +10,13 @@ class RepositoryType(enum.Enum):
     """Supported types of repository."""
 
     ACTOR = "actor"
-    """Actor repository."""
+    """SDK actor repository."""
 
     API = "api"
-    """API repository."""
+    """gRPC API repository."""
 
     APP = "app"
-    """App repository."""
+    """SDK application repository."""
 
     LIB = "lib"
-    """Library repository."""
+    """General purpose library repository."""