chore: remove docusaurus metadata from README.md (#8624)

docs/api/puppeteer.commoneventemitter.once.md

@@ -1,24 +1,22 @@
----
-sidebar_label: CommonEventEmitter.once
----
-
-# CommonEventEmitter.once() method
-
-**Signature:**
-
-```typescript
-interface CommonEventEmitter {
-  once(event: EventType, handler: Handler): CommonEventEmitter;
-}
-```
-
-## Parameters
-
-| Parameter | Type                                  | Description |
-| --------- | ------------------------------------- | ----------- |
-| event     | [EventType](./puppeteer.eventtype.md) |             |
-| handler   | [Handler](./puppeteer.handler.md)     |             |
-
-**Returns:**
-
-[CommonEventEmitter](./puppeteer.commoneventemitter.md)
+---
+sidebar_label: CommonEventEmitter.once
+---
+# CommonEventEmitter.once() method
+
+**Signature:**
+
+```typescript
+interface CommonEventEmitter {once(event: EventType, handler: Handler): CommonEventEmitter;}
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  event | [EventType](./puppeteer.eventtype.md) |  |
+|  handler | [Handler](./puppeteer.handler.md) |  |
+
+**Returns:**
+
+[CommonEventEmitter](./puppeteer.commoneventemitter.md)
+