Update provision_auto_cisco.rst

source/applications/provision/provision_auto_cisco.rst

@@ -52,3 +52,6 @@ http://192.168.1.4/admin/resync?%5B--uid+admin+--pwd+555%5Dhttp://domain.com/app
 DHCP Option
 =============
 Use the DHCP Option 66 to deliver the provisioning URL to the phones without using the web interface.
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+More information can also be found at https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/csbpvga/spa100-200/provisioning/guide/SPA100-200_Provisioning.pdf