Correlations: change casing of *UID properties (#52836)

* Correlations: change casing of *UID properties

* add link to correlations HTTP API

pkg/services/provisioning/datasources/testdata/all-properties/all-properties.yaml

@@ -13,7 +13,7 @@ datasources:
     withCredentials: true
     isDefault: true
     correlations:
-      - targetUid: a target
+      - targetUID: a target
         label: a label
         description: a description
     jsonData:

pkg/services/provisioning/datasources/testdata/one-datasource-two-correlations/one-datasource-two-correlations.yaml

@@ -7,9 +7,9 @@ datasources:
     access: proxy
     url: http://localhost:8080
     correlations:
-      - targetUid: graphite
+      - targetUID: graphite
         label: a label
         description: a description
-      - targetUid: graphite
+      - targetUID: graphite
         label: a second label
         description: a second description

pkg/services/provisioning/datasources/testdata/version-0/version-0.yaml

@@ -11,7 +11,7 @@ datasources:
     with_credentials: true
     is_default: true
     correlations:
-      - targetUid: a target
+      - targetUID: a target
         label: a label
         description: a description
     json_data: