Made skip_docs the default
Made skip_docs the default

I discussed this change with camthornton@, and we agreed that in most cases it makes sense to skip_docs because

- Supplementing https://registry.terraform.io was not original purpose of using MM for CGC samples
- The examples are often redundant to what's already on https://registry.terraform.io
- Often the resource that would be updated is just a small piece of a larger example
GoogleCloudPlatform/terraform-sample-tools,GoogleCloudPlatform/terraform-sample-tools,GoogleCloudPlatform/terraform-sample-tools