update payload attestation get to have slot in path

Author: shane-moore

apis/validator/payload_attestation_data.yaml

@@ -13,7 +13,7 @@ get:
     A 503 error must be returned if the beacon node is currently syncing.
   parameters:
     - name: slot
-      in: query
+      in: path
       required: true
       description: "The slot for which payload attestation data should be created."
       schema:

beacon-node-oapi.yaml

@@ -194,7 +194,7 @@ paths:
     $ref: "./apis/validator/block.v4.yaml"
   /eth/v1/validator/attestation_data:
     $ref: "./apis/validator/attestation_data.yaml"
-  /eth/v1/validator/payload_attestation_data:
+  /eth/v1/validator/payload_attestation_data/{slot}:
     $ref: "./apis/validator/payload_attestation_data.yaml"
   /eth/v2/validator/aggregate_attestation:
     $ref: "./apis/validator/aggregate_attestation.v2.yaml"