Document cy.server({ onAny* }) functions (#1652)
Document cy.server({ onAny* }) functions (#1652)

* Document cy.server({ onAny* }) functions

* Added example for setting custom request header using onAnyRequest

- Some formatting
- alphabetize options


Co-authored-by: Jennifer Shehane <e3cd9f6469fc3e1acfb9f2bdbfc5a3d2bbb8e2ad@cypress.io>
cypress-io/cypress-documentation,cypress-io/cypress-documentation