Add GPP support to Beachfront doc (#4728)

* add gpp support to beachfront doc

* linter fix

---------

Co-authored-by: John Salis <john@beachfront.com>
Co-authored-by: bretg <bgorsline@gmail.com>

dev-docs/bidders/beachfront.md

@@ -8,6 +8,7 @@ floors_supported: true
 fpd_supported: true
 gdpr_supported: true
 usp_supported: true
+gpp_supported: true
 userIds: unifiedId, identityLink, uid2, hadronId
 schain_supported: true
 prebid_member: true
@@ -88,7 +89,7 @@ Publishers should use the `ortb2` method of setting First Party Data. The follow
 
 Example first party data that's available to all bidders and all adunits:
 
-```
+```javascript
 pbjs.setConfig({
     ortb2: {
         site: {