Apply suggestions from code review

Author: mydea

dev-packages/node-integration-tests/suites/express/without-tracing/test.ts

@@ -13,7 +13,7 @@ test('correctly applies isolation scope even without tracing', done => {
           global: 'tag',
           'isolation-scope': 'tag',
           'isolation-scope-1': '1',
-          // We can't properly test non-existance of fields here, so we cast this to a string to test it here
+          // We can't properly test non-existence of fields here, so we cast this to a string to test it here
           'isolation-scope-transactionName': 'undefined',
         },
         // Request is correctly set
@@ -31,7 +31,7 @@ test('correctly applies isolation scope even without tracing', done => {
           global: 'tag',
           'isolation-scope': 'tag',
           'isolation-scope-2': '2',
-          // We can't properly test non-existance of fields here, so we cast this to a string to test it here
+          // We can't properly test non-existence of fields here, so we cast this to a string to test it here
           'isolation-scope-transactionName': 'undefined',
         },
         // Request is correctly set