Remove empty sections from the manual

doc/src/manual/cowboy_handler.ezdoc

@@ -20,10 +20,6 @@ defines the basic interface for handlers. All Cowboy handlers
 implement at least the `init/2` callback, and may implement
 the `terminate/3` callback optionally.
 
-:: Types
-
-None.
-
 :: Terminate reasons
 
 The following values may be received as the terminate reason

doc/src/manual/cowboy_loop.ezdoc

@@ -18,10 +18,6 @@ when no data has been received during that timespan. The
 default timeout is `infinity`, which should only be used if
 you have alternate means of ending inactive connections.
 
-:: Types
-
-None.
-
 :: Terminate reasons
 
 The following values may be received as the terminate reason
@@ -94,7 +90,3 @@ typically because a response has been sent.
 
 The `hibernate` option will hibernate the process until
 it receives another message.
-
-:: Exports
-
-None.

doc/src/manual/cowboy_protocol.ezdoc

@@ -73,7 +73,3 @@ Fun called every time a response is sent.
 : timeout (5000)
 
 Time in ms with no requests before Cowboy closes the connection.
-
-:: Exports
-
-None.

doc/src/manual/cowboy_rest.ezdoc

@@ -11,10 +11,6 @@ in the manual for the ^cowboy_handler module.
 All other callbacks are optional, though some may become
 required depending on the return value of previous callbacks.
 
-:: Types
-
-None.
-
 :: Meta values
 
 : charset

doc/src/manual/cowboy_spdy.ezdoc

@@ -32,7 +32,3 @@ List of middlewares to execute for every requests.
 : onresponse (undefined)
 
 Fun called every time a response is sent.
-
-:: Exports
-
-None.

doc/src/manual/cowboy_sub_protocol.ezdoc

@@ -3,10 +3,6 @@
 The `cowboy_sub_protocol` behaviour defines the interface used
 by modules that implement a protocol on top of HTTP.
 
-:: Types
-
-None.
-
 :: Callbacks
 
 : upgrade(Req, Env, Handler, Opts)

doc/src/manual/cowboy_websocket.ezdoc

@@ -159,7 +159,3 @@ being closed.
 The `hibernate` option will hibernate the process until
 it receives another message or new data from the Websocket
 connection.
-
-:: Exports
-
-None.