Corrected civix generate:custom-xml
Created by: andrewpthompson
Changed civix generate:custom-data
to civix generate:custom-xml
as the former is incorrect. Also corrected grammar in subheading "Extending a subtype".
Created by: andrewpthompson
Changed civix generate:custom-data
to civix generate:custom-xml
as the former is incorrect. Also corrected grammar in subheading "Extending a subtype".