Document that there can be multiple workers handling the receipts stream (#18760)

Author: benbz

changelog.d/18760.doc.md

@@ -0,0 +1 @@
+Document that there can be multiple workers handling the `receipts` stream.

docs/workers.md

@@ -532,8 +532,9 @@ the stream writer for the `account_data` stream:
 
 ##### The `receipts` stream
 
-The following endpoints should be routed directly to the worker configured as
-the stream writer for the `receipts` stream:
+The `receipts` stream supports multiple writers. The following endpoints
+can be handled by any worker, but should be routed directly to one of the workers
+configured as stream writer for the `receipts` stream:
 
     ^/_matrix/client/(r0|v3|unstable)/rooms/.*/receipt
     ^/_matrix/client/(r0|v3|unstable)/rooms/.*/read_markers
@@ -555,7 +556,7 @@ the stream writer for the `push_rules` stream:
 ##### The `device_lists` stream
 
 The `device_lists` stream supports multiple writers. The following endpoints
-can be handled by any worker, but should be routed directly one of the workers
+can be handled by any worker, but should be routed directly to one of the workers
 configured as stream writer for the `device_lists` stream:
 
     ^/_matrix/client/(r0|v3)/delete_devices$