Spelling fixes. From Mike Taves <mwtoews@gmail.com> in <https://lists.gnu.org/archive/html/bug-gnu-libiconv/2024-10/msg00002.html>. * NOTES: Fix grammar. * lib/iconv_open1.h: Fix a typo in comments. * lib/iso2022_jp2.h: Likewise. * lib/iso2022_jpms.h: Fix English spelling in comments.