fixing yaml lint issues

test/tracetesting/frontend-service/01-see-ads.yaml

@@ -33,4 +33,3 @@ spec:
     selector: span[tracetest.span.type="rpc" name="oteldemo.AdService/GetAds" rpc.system="grpc" rpc.method="GetAds" rpc.service="oteldemo.AdService"]
     assertions:
     - attr:app.ads.count = 2
-

test/tracetesting/frontend-service/02-get-product-recommendation.yaml

@@ -25,7 +25,7 @@ spec:
           ]
         }
   specs:
-  - name: It called the frontend with success 
+  - name: It called the frontend with success
     selector: span[tracetest.span.type="general" name="Tracetest trigger"]
     assertions:
     - attr:tracetest.response.status = 200

test/tracetesting/frontend-service/03-browse-product.yaml

@@ -29,4 +29,3 @@ spec:
     assertions:
     - attr:rpc.grpc.status_code  =  0
     - attr:app.product.id  =  "0PUK6V6EV0"
-

test/tracetesting/payment-service/valid-credit-card.yaml

@@ -29,8 +29,9 @@ spec:
   specs:
   - name: It should call Charge method successfully
     selector: span[tracetest.span.type="rpc" name="grpc.oteldemo.PaymentService/Charge" rpc.system="grpc" rpc.method="Charge" rpc.service="oteldemo.PaymentService"]
-    assertions: # instead of returning status_code 0, this service returns 1, but it works as intended
-    - attr:rpc.grpc.status_code = 1 
+    # instead of returning status_code 0, this service returns 1, but it works as intended
+    assertions:
+    - attr:rpc.grpc.status_code = 1
   - name: It should return a transaction ID
     selector: span[tracetest.span.type="general" name="Tracetest trigger"]
     assertions: