Fix spelling mistakes in documentation

src/runtime_events/lwt_runtime_events.mli

@@ -3,25 +3,25 @@
     lwt produces) and the function to emit them (so that lwt can emit them). This
     library is not intended for emitting events by hand. *)
 
-(** Counter event indicatiing the number of paused promise, i.e., the number of
+(** Counter event indicating the number of paused promises, i.e., the number of
     calls to [Lwt.pause] which have not yet been resolved. *)
 type Runtime_events.User.tag += Paused_count
 val paused_count : int Runtime_events.User.t
 val emit_paused_count : int -> unit
 
-(** Span event indicatiing that [Lwt_main.run] has been called and hasn't
+(** Span event indicating that [Lwt_main.run] has been called and hasn't
     returned yet, i.e., when the Lwt scheduler is running. *)
 type Runtime_events.User.tag += Scheduler_call
 val sch_call : Runtime_events.Type.span Runtime_events.User.t
 val emit_sch_call_begin : unit -> unit
 val emit_sch_call_end : unit -> unit
 
-(** Punctual event indicatiing that the scheduler is performing one loop. *)
+(** Punctual event indicating that the scheduler is performing one loop. *)
 type Runtime_events.User.tag += Scheduler_lap
 val sch_lap : unit Runtime_events.User.t
 val emit_sch_lap : unit -> unit
 
-(** Counter event indicatiing the number of unix I/O jobs, i.e., the number of
+(** Counter event indicating the number of unix I/O jobs, i.e., the number of
     calls to [Lwt_unix.*] which have not yet been resolved. *)
 type Runtime_events.User.tag += Unix_job_count
 val unix_job_count : int Runtime_events.User.t
@@ -31,7 +31,7 @@ module Trace : sig
   type t = { kind: Runtime_events.Type.span; context: string option; filename: string; line: int; }
   val t : t Runtime_events.Type.t
 
-  (** Span event indicatiing that a promise is taking time to resolve. The
+  (** Span event indicating that a promise is taking time to resolve. The
       event indicates the location of the bind for the promise. These events are
       automatically emitted by code produced by the lwt_ppx syntax extension. *)
   type Runtime_events.User.tag += T