attribs: Improve diagnostics

attribs: Improve diagnostics

When looking at the attribs code, I've noticed weird diagnostics
like
int a __attribute__((section ("foo", "bar")));
a.c:1:1: error: wrong number of arguments specified for ‘section’ attribute
    1 | int a __attribute__((section ("foo", "bar")));
      | ^~~
a.c:1:1: note: expected between 1 and 1, found 2
As roughly 50% of attributes that accept any arguments have
spec->min_length == spec->max_length, I think it is worth it to have
separate wording for such common case and just write simpler
a.c:1:1: note: expected 1, found 2

2022-09-23  Jakub Jelinek  <jakub@redhat.com>

	* attribs.cc (decl_attributes): Improve diagnostics, instead of
	saying expected between 1 and 1, found 2 just say expected 1, found 2.