Update docstring

mex/common/context.py

@@ -4,7 +4,12 @@
 
 
 class ContextStore(Generic[ContextResource]):
-    """Drop-in replacement for `ContextVar`s to store global instances."""
+    """Drop-in replacement for `ContextVar`s to store global instances.
+
+    Since we are not using asynchronous code yet, we simply want to store
+    configuration state or connection pools in a controlled way without
+    worrying about concurrent context management.
+    """
 
     def __init__(self, name: str, default: ContextResource) -> None:
         """Create a new context store with an identifiable name and a default value."""