maint: fix common spelling errors

maint: fix common spelling errors

These were identified using: https://github.com/lyda/misspell-check
executed like: git ls-files | misspellings -f -

* src/cat.c: Correct a spelling error.
* src/comm.c: Likewise.
* src/expr.c: Likewise.
* src/pr.c: Likewise.
* src/tac.c: Likewise.
* src/test.c: Likewise.
* src/ChangeLog-2005: Likewise.
* src/ChangeLog-2007: Likewise.
* src/NEWS: Likewise.
* src/doc/coreutils.texi: Likewise.
* src/lib/ChangeLog-2007: Likewise.
* src/man/help2man: Likewise.
* src/old/fileutils/ChangeLog-1997: Likewise.
* src/old/fileutils/NEWS: Likewise.
* src/old/sh-utils/ChangeLog.0: Likewise.
* src/old/textutils/ChangeLog: Likewise.
* src/tests/misc/comm: Likewise.
* src/tests/misc/uniq: Likewise.
* src/tests/mv/dir2dir: Likewise.
* src/cfg.mk (old_NEWS_hash): update with `make update-NEWS-hash`