Too many spaces

Co-Authored-By: Travis Ralston <travpc@gmail.com>

specification/client_server_api.rst

@@ -790,7 +790,7 @@ Dummy Auth
   Dummy authentication always succeeds and requires no extra parameters. Its
   purpose is to allow servers to not require any form of User-Interactive
   Authentication to perform a request. It can also be used to differentiate
-  flows where otherwise one flow would be a subset  of another flow. eg. if
+  flows where otherwise one flow would be a subset of another flow. eg. if
   a server offers flows ``m.login.recaptcha`` and ``m.login.recaptcha,
   m.login.email.identity`` and the client completes the recaptcha stage first,
   the auth would succeed with the former flow, even if the client was intending