Update README.md to fix broken link

[mknw]

The previous link resulted in a 404 error. The updated one redirects to the intended page/id.

• old: https://terraform.io/providers/hashicorp/google/r/docs/resources/compute_instance_template.html#service_account
• new: https://terraform.io/providers/hashicorp/google/r/docs/resources/compute_instance_template#service_account

[comment-bot-dev]

Thanks for the PR! 🚀 Unfortunately it looks like some of our CI checks failed. See the Contributing Guide for details.

• ⚠️check_generate_modules The modules need to be regenerated. Please run make_build.

Checking submodule's files generation
diff -r '--exclude=.terraform' '--exclude=.kitchen' '--exclude=.git' /workspace/modules/instance_template/README.md /tmp/tmp.o741XGD3gU/workspace/modules/instance_template/README.md
41c41
< | service\_account | Service account to attach to the instance. See https://www.terraform.io/docs/providers/google/r/compute_instance_template#service_account. | <pre>object({<br>    email  = string<br>    scopes = set(string)<br>  })</pre> | n/a | yes |
---
> | service\_account | Service account to attach to the instance. See https://www.terraform.io/docs/providers/google/r/compute_instance_template.html#service_account. | <pre>object({<br>    email  = string<br>    scopes = set(string)<br>  })</pre> | n/a | yes |
Error: submodule's files generation has not been run, please run the
'make build' command and commit changes

• ⚠️check_documentation The documentation needs to be regenerated. Please run make generate_docs.

Checking for documentation generation
diff -r '--exclude=.terraform' '--exclude=.kitchen' '--exclude=.git' '--exclude=autogen' '--exclude=*.tfvars' /workspace/modules/instance_template/README.md /tmp/tmp.5kWM2AYPcG/generate_docs/workspace/modules/instance_template/README.md
41c41
< | service\_account | Service account to attach to the instance. See https://www.terraform.io/docs/providers/google/r/compute_instance_template#service_account. | <pre>object({<br>    email  = string<br>    scopes = set(string)<br>  })</pre> | n/a | yes |
---
> | service\_account | Service account to attach to the instance. See https://www.terraform.io/docs/providers/google/r/compute_instance_template.html#service_account. | <pre>object({<br>    email  = string<br>    scopes = set(string)<br>  })</pre> | n/a | yes |
Error: Documentation generation has not been run, please run the
'make docker_generate_docs' command and commit the above changes.

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