add @SInCE tags

lib/lwt_inotify.mli

@@ -12,16 +12,19 @@ type t
 (** [create ()] returns a new inotify descriptor. *)
 val create    : unit -> t Lwt.t
 val create'   : unit -> t
+(** @since 2.5 *)
 
 (** [add_watch desc path events] sets up [desc] to watch for [events] occuring
     to [path], and returns a watch descriptor. *)
 val add_watch  : t -> string -> Inotify.selector list -> Inotify.watch Lwt.t
 val add_watch' : t -> string -> Inotify.selector list -> Inotify.watch
+(** @since 2.5 *)
 
 
 (** [rm_watch desc watch] stops [desc] from watching [watch]. *)
 val rm_watch  : t -> Inotify.watch -> unit Lwt.t
 val rm_watch' : t -> Inotify.watch -> unit
+(** @since 2.5 *)
 
 (** [read desc] waits for an event to occur at [desc]. *)
 val read      : t -> Inotify.event Lwt.t