Update docstrings for request context and samples

Author: samwelkanda

msgraph/core/_graph_client.py

@@ -26,6 +26,7 @@
 
 
 def attach_context(func):
+    """Attaches a request context object to every graph request"""
     def wrapper(*args, **kwargs):
         middleware_control = dict()
 

msgraph/core/middleware/request_context.py

@@ -8,7 +8,22 @@
 
 
 class RequestContext:
+    """A request context contains data that is persisted throughout the request and
+    includes a ClientRequestId property, MiddlewareControl property to control behavior
+    of middleware as well as a FeatureUsage  property to keep track of middleware used
+    in making the request.
+    """
     def __init__(self, middleware_control, headers):
+        """Constructor for request context instances
+
+        Args:
+            middleware_control (dict): A dictionary of optional middleware options
+            that can be accessed by middleware components to override the options provided
+            during middleware initialization,
+
+            headers (dict): A dictionary containing the request headers. Used to check for a
+            user provided client request id.
+        """
         self.middleware_control = middleware_control
         self.client_request_id = headers.get('client-request-id', str(uuid.uuid4()))
         self._feature_usage = FeatureUsageFlag.NONE

samples/retry_handler_samples.py

@@ -19,7 +19,7 @@
 
 def sample_http_client_with_custom_retry_defaults():
     """
-    Initializing a sample client with default middleware using the HTTPClientand passing
+    Initializing a sample client with default middleware using the HTTPClient and passing
     default configs to the retryhandler. These defaults will be used for every subsequent
     request using the client."""