Update ec2_vpc_dhcp_option_info to remove deprecated alias (#917)

Update ec2_vpc_dhcp_option_info to remove deprecated alias

SUMMARY
With #913 the CamelCase aliases in ec2_vpc_dhcp_option_info were dropped.
Updates the example to use the snake case version
ISSUE TYPE

Docs Pull Request

COMPONENT NAME
plugins/modules/ec2_vpc_dhcp_option_info.py
ADDITIONAL INFORMATION

Reviewed-by: Alina Buzachis <None>

plugins/modules/ec2_vpc_dhcp_option_info.py

@@ -57,7 +57,7 @@
   amazon.aws.ec2_vpc_dhcp_option_info:
     region: ap-southeast-2
     profile: production
-    DhcpOptionsIds: dopt-123fece2
+    dhcp_options_ids: dopt-123fece2
   register: dhcp_info
 
 '''