docs: updated invoice description (#201)

Author: stainless-app[bot]

src/orb/resources/invoices.py

@@ -234,9 +234,6 @@ def fetch(
         This endpoint is used to fetch an [`Invoice`](../guides/concepts#invoice) given
         an identifier.
 
-        This endpoint supports returning ApiCachedUsageData (see
-        api/cache_control_utils.py)
-
         Args:
           extra_headers: Send extra headers
 
@@ -272,9 +269,6 @@ def fetch_upcoming(
         [invoice](../guides/concepts#invoice) for the current billing period given a
         subscription.
 
-        This endpoint supports returning ApiCachedUsageData (see
-        api/cache_control_utils.py)
-
         Args:
           extra_headers: Send extra headers
 
@@ -651,9 +645,6 @@ async def fetch(
         This endpoint is used to fetch an [`Invoice`](../guides/concepts#invoice) given
         an identifier.
 
-        This endpoint supports returning ApiCachedUsageData (see
-        api/cache_control_utils.py)
-
         Args:
           extra_headers: Send extra headers
 
@@ -689,9 +680,6 @@ async def fetch_upcoming(
         [invoice](../guides/concepts#invoice) for the current billing period given a
         subscription.
 
-        This endpoint supports returning ApiCachedUsageData (see
-        api/cache_control_utils.py)
-
         Args:
           extra_headers: Send extra headers