chore: comments in the .mli

Signed-off-by: Antonio Nuno Monteiro <[email protected]>

src/dune_rules/findlib/findlib.mli

@@ -51,16 +51,21 @@ module Config : sig
 
   val to_dyn : t -> Dyn.t
 
+  (** Finds the library search paths for this configuration, prepending
+      [OCAMLPATH] if set *)
   val path : t -> Path.t list
 
+  (** Finds program [prog] for this configuration, if it exists *)
   val tool : t -> prog:string -> Path.t option Memo.t
 
   val ocamlpath_sep : char
 
+  (** Read and parse the [OCAMLPATH] environment variable *)
   val ocamlpath : Env.t -> Path.t list
 
   val extra_env : t -> Env.t
 
+  (** Load the findlib configuration for this [findlib_toolchain], if any. *)
   val discover_from_env :
        env:Env.t
     -> which:(string -> Path.t option Memo.t)