address first part of feedback

docs/src/test-reporter-api/class-teststep.md

@@ -51,14 +51,14 @@ Start time of this particular test step.
 List of steps inside this step.
 
 ## property: TestStep.attachments
-* since: v1.10
+* since: v1.50
 - type: <[Array]<[Object]>>
   - `name` <[string]> Attachment name.
   - `contentType` <[string]> Content type of this attachment to properly present in the report, for example `'application/json'` or `'image/png'`.
   - `path` ?<[string]> Optional path on the filesystem to the attached file.
   - `body` ?<[Buffer]> Optional attachment body used instead of a file.
 
-The list of files or buffers attached in the step execution through [`property: TestInfo.attachments`].
+The list of files or buffers attached in the step execution through [`method: TestInfo.attach`].
 
 ## property: TestStep.title
 * since: v1.10

packages/playwright/src/isomorphic/teleReceiver.ts

@@ -517,7 +517,7 @@ class TeleTestStep implements reporterTypes.TestStep {
   duration: number = -1;
   steps: reporterTypes.TestStep[] = [];
   attachments: reporterTypes.TestStep['attachments'] = [];
-  error?: reporterTypes.TestError | undefined;
+  error: reporterTypes.TestError | undefined;
 
   private _startTime: number = 0;
   _attachmentIndices: number[] = [];

packages/playwright/src/worker/testInfo.ts

@@ -239,7 +239,7 @@ export class TestInfoImpl implements TestInfo {
     }
   }
 
-  _parentStep() {
+  private _parentStep() {
     return zones.zoneData<TestStepInternal>('stepZone')
       ?? this._findLastStageStep(this._steps); // If no parent step on stack, assume the current stage as parent.
   }

packages/playwright/types/testReporter.d.ts

@@ -693,7 +693,7 @@ export interface TestStep {
 
   /**
    * The list of files or buffers attached in the step execution through
-   * [testInfo.attachments](https://playwright.dev/docs/api/class-testinfo#test-info-attachments).
+   * [testInfo.attach(name[, options])](https://playwright.dev/docs/api/class-testinfo#test-info-attach).
    */
   attachments: Array<{
     /**