Use "must not" instead of "cannot" wording

ext/posix: posix_eaccess little update and forgotten UPGRADING entry. (#10965)

ext/posix: proposing posix_eaccess. unlike access, it is not standard but available in enough platforms ; on linux it's euidaccess in reality eaccess being 'just' an alias. key difference is eaccess

ext/posix: proposing posix_eaccess. unlike access, it is not standard but available in enough platforms ; on linux it's euidaccess in reality eaccess being 'just' an alias. key difference is eaccess checks the effective user id instead.

Close GH-10917

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