correct spelling of "deprecated" in help info

the word "deprecated" was accidentally spelled "depgrecated"
Merge pull request #336 from bpmason1/patch-1

correct spelling of "deprecated" in help info
nsqd: default TLS client auth type should be NoClientCert
Merge pull request #337 from mreiferson/tls_client_cert_default_337

nsqd: fix TLS default client auth type