SchemaMarkdown introduces unhelpful new lines

### Terraform CLI and terraform-plugin-docs Versions

github.com/hashicorp/terraform-plugin-docs v0.24.0 // indirect

❯ terraform version
Terraform v1.14.0
on darwin_arm64

### Provider Code

```go
Template https://github.com/scaleway/terraform-provider-scaleway/blob/5c65640fbe1c9777d98282f9456bed794668c7e3/templates/actions/instance_server_action.md.tmpl

Schema https://github.com/scaleway/terraform-provider-scaleway/blob/5c65640fbe1c9777d98282f9456bed794668c7e3/internal/services/instance/action_server_action.go#L69-L91
```

### Expected Behavior

I expected to have a schema without so many new lines at the end

### Actual Behavior

I got a file with many new lines at the end

### Steps to Reproduce

1. `tfplugindocs generate`
2. Using `markdown-lint` with a configuration file that checks for MD012 https://github.com/DavidAnson/markdownlint/blob/main/doc/md012.md

### How much impact is this issue causing?

Low

### Logs

_No response_

### Additional Information

_No response_

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct