chore: generate docs

Author: kangasta

docs/builders/upcloud.mdx

@@ -109,7 +109,7 @@ The upcloud builder is used to generate storage templates on UpCloud.
 -->
 ### Example Usage
 
-Here is a sample template, which you can also find in the [example](https://github.com/UpCloudLtd/packer-plugin-upcloud/tree/master/example) directory.  
+Here is a sample template, which you can also find in the [example](https://github.com/UpCloudLtd/packer-plugin-upcloud/tree/main/example) directory.
 It reads your UpCloud API credentials from the environment variables, creates an Ubuntu 20.04 LTS server in the `nl-ams1` region and authorizes root user to loggin with your public SSH key.
 
 ```hcl