Aligned with laravel/cashier
Add a note about nested resource controllers
Added saveMany() to documentation for hasMany relationship

Signed-off-by: Jake Wilson <jake.e.wilson@gmail.com>
Details about passing additional data

Added details about passing additional info for the new customer
Missing dot
Merge pull request #834 from nikoskip/patch-6

Missing dot
Merge pull request #831 from Jakobud/feature/add-savemany

Added saveMany() to documentation for hasMany relationship
Merge pull request #829 from msurguy/patch-6

Details about passing additional data
Merge pull request #825 from Nesk/patch-1

Add a note about nested resource controllers
Work on wording.
Merge pull request #823 from GrahamCampbell/patch-1

Aligned docs with laravel/cashier
Working on docs.
Add heading.