array.c: new names of rb_ary_new family

* array.c (rb_ary_new_capa): add better names of rb_ary_new2.
* array.c (rb_ary_new_from_args): ditto for rb_ary_new3.
* array.c (rb_ary_new_from_values): ditto for rb_ary_new4.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40999 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
array.c: aliases to rb_ary_new family

* README.EXT.ja: add new names.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41000 b2dd03c8-39d4-4d8f-98ff-823fe69b080e