Add 'partner central' service metadata to services.yaml

Author: brmur

aws_doc_sdk_examples_tools/config/services.yaml

@@ -2372,8 +2372,8 @@ outposts:
     product_categories: {}
   version: outposts-2019-12-03
 partnercentral-selling:
-  long: '&partnercentral;'
-  short: '&pcsh;'
+  long: '&AWS; Partner Central'
+  short: 'Partner Central'
   sort: Partner Central
   expanded:
     long: AWS Partner Central