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.
5 files changed