docs: documented the sregex-cli command-line utility a bit more.
docs: documented the sregex-cli command-line utility a bit more.

MarginC/sregex,openresty/sregex,openresty/sregex,MarginC/sregex,openresty/sregex,MarginC/sregex,MarginC/sregex,openresty/sregex,MarginC/sregex