docs(Logger): tweaks

src/LoggerSigs.ml

@@ -135,7 +135,7 @@ sig
   val try_with : ?emit:(Code.t Diagnostic.t -> unit) -> ?fatal:(Code.t Diagnostic.t -> 'a) -> (unit -> 'a) -> 'a
 
   val register_printer : ([ `Emit of Code.t Diagnostic.t | `Fatal of Code.t Diagnostic.t ] -> string option) -> unit
-  (** [register_printer f] registers a printer [p] via {!val:Printexc.register_printer} to convert unhandled internal effects and exceptions into strings for the OCaml runtime system to display. Ideally, all internal effects and exceptions will be handled by {!val:run} and there is no need to use this function, but it could be useful for debugging when it is that the case. The functor {!module:Logger.Make} always registers a simple printer to suggest using {!val:run}, but you can register new ones to override it. The return type of the printer [p] should return [Some s] where [s] is the resulting string, or [None] if it chooses not to convert a particular effect or exception. The registered printers are tried in reverse order until one of them returns [Some s] for some [s]; that is, the last registered printer is tried first. Note that this function is a wrapper of {!val:Printexc.register_printer} and all the registered printers (via this function or {!val:Printexc.register_printer}) are put into the same list.
+  (** [register_printer f] registers a printer [p] via {!val:Printexc.register_printer} to convert unhandled internal effects and exceptions into strings for the OCaml runtime system to display. Ideally, all internal effects and exceptions should have been handled by {!val:run} and there is no need to use this function, but when it is not the case, this function can be helpful for debugging. The functor {!module:Logger.Make} always registers a simple printer to suggest using {!val:run}, but you can register new ones to override it. The return type of the printer [p] should return [Some s] where [s] is the resulting string, or [None] if it chooses not to convert a particular effect or exception. The registered printers are tried in reverse order until one of them returns [Some s] for some [s]; that is, the last registered printer is tried first. Note that this function is a wrapper of {!val:Printexc.register_printer} and all the registered printers (via this function or {!val:Printexc.register_printer}) are put into the same list.
 
       The input type of the printer [p] is a variant representation of all internal effects and exceptions used in this module:
       - [`Emit diag] corresponds to the effect triggered by {!val:emit}; and