chore: update placeholder string

Author: stainless-app[bot]

tests/api-resources/workbooks.test.ts

@@ -128,7 +128,7 @@ describe('resource workbooks', () => {
   // Mock server tests are disabled
   test.skip('upload: only required params', async () => {
     const responsePromise = client.workbooks.upload({
-      file: await toFile(Buffer.from('# my file contents'), 'README.md'),
+      file: await toFile(Buffer.from('Example data'), 'README.md'),
     });
     const rawResponse = await responsePromise.asResponse();
     expect(rawResponse).toBeInstanceOf(Response);
@@ -142,7 +142,7 @@ describe('resource workbooks', () => {
   // Mock server tests are disabled
   test.skip('upload: required and optional params', async () => {
     const response = await client.workbooks.upload({
-      file: await toFile(Buffer.from('# my file contents'), 'README.md'),
+      file: await toFile(Buffer.from('Example data'), 'README.md'),
     });
   });