Fix spec for error_info/2

Summary: The open sourced `wa_assert_parse_trans` uses `error_info` by passing it a string literal, not a binary. Fix spec accordingly.

Reviewed By: robertoaloi

Differential Revision: D85242464

fbshipit-source-id: 4ae29e973a9f6189dd104c7ea07bbca503796ef2

Author: VLanvin

src/wa_assert.erl

@@ -44,7 +44,7 @@ assert_error_info(Expression, #{type := generic} = Meta) ->
 assert_error_info(_Expression, _Meta) ->
     {error, no_error_info}.
 
--spec error_info(binary(), pins()) -> {ok, error_info(match_cause())}.
+-spec error_info(string(), pins()) -> {ok, error_info(match_cause())}.
 error_info(Pattern, Pins) ->
     Cause = #{pins => Pins, pattern => Pattern},
     {ok, #{module => ?MODULE, function => format_error, cause => Cause}}.