This looks like a typo to me caused by the addition of the new paragraph 5.1.3.5.7 for the Auxiliary Source Connection.
NFPA 99, 2015 (My comments are underlined below.)
5.1.13.3 Sources.
5.1.13.3.1 Support gases shall be permitted to be supplied from the same sources as patient care gases. Where this is done, they shall be treated as the patient care gas and not as a support gas (see 5.1.1 through 5.1.12 and 5.1.14).
5.1.13.3.2 Sources for support gases delivered from cylinders shall comply with 5.1.3.3 through 5.1.3.5.10. (10 should say 11.)
5.1.13.3.3 Sources for support gases delivered from containers
shall comply with 5.1.3.3 through 5.1.3.5.11 except 5.1.3.5.10. (10 should say 11 and 11 should say 12.)
5.1.13.3.4 Sources for support gases delivered from bulk sources shall comply with 5.1.3.3 through 5.1.3.5.11 except 5.1.3.5.10. (10 should say 11 and 11 should say 14.)