Fix use of prefer with '-ing' (elixir-lang#14568)

Author: joeyates

lib/elixir/lib/port.ex

@@ -78,7 +78,7 @@ defmodule Port do
 
   The port can be opened through four main mechanisms.
 
-  As a short summary, prefer to using the `:spawn` and `:spawn_executable`
+  As a short summary, prefer to use the `:spawn` and `:spawn_executable`
   options mentioned below. The other two options, `:spawn_driver` and `:fd`
   are for advanced usage within the VM. Also consider using `System.cmd/3`
   if all you want is to execute a program and retrieve its return value.

lib/elixir/src/elixir_map.erl

@@ -306,6 +306,6 @@ format_error(ignored_struct_key_in_struct) ->
   "key :__struct__ is ignored when using structs";
 format_error({deprecated_update, Struct, MapUpdate}) ->
   io_lib:format("the struct update syntax is deprecated:\n\n~ts\n\n"
-                "Instead, prefer to pattern matching on structs when the variable is first defined and "
+                "Instead, prefer to pattern match on structs when the variable is first defined and "
                 "use the regular map update syntax instead:\n\n~ts\n",
                 ['Elixir.Macro':to_string({'%', [], [Struct, MapUpdate]}), 'Elixir.Macro':to_string(MapUpdate)]).