docs: agent/options gcp's project_name is optional

Per https://github.com/hashicorp/go-discover/blob/master/provider/gce/gce_discover.go#L53-L61
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Radek Simko 2017-10-07 15:23:03 +01:00 committed by Frank Schröder
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commit 0075421b1a
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@ -344,8 +344,8 @@ will exit with an error at startup.
```
- `provider` (required) - the name of the provider ("gce" in this case).
- `project_name` (required) - the name of the project to auto-join on.
- `tag_value` (required) - the value of the tag to auto-join on.
- `project_name` (optional) - the name of the project to auto-join on. Discovered if not set.
- `zone_pattern` (optional) - the list of zones can be restricted through an RE2 compatible regular expression. If omitted, servers in all zones are returned.
- `credentials_file` (optional) - the credentials file for authentication. See below for more information.