Update notes for submitted changes

* [ARM] libc: optimized strnlen, strncat, strncmp, and strlcat
* libc: fix __cxa_atexit implicit declaration
* [ARM] libc: define return and conditional return macros
* libc stdlib: implement C99 _Exit and C11 quick_exit API
* libc: support __errno_location
* libm: add fmal long double stub
* libm: sync with upstream freebsd
* [ARM NEON] libm: original optimized modf