chore(docs): reduce warnings when generating docs (#6138)

* chore(docs): reduce warnings when generating docs

This is a bunch of small miscellaneous fixes that reduce the amount of
warnings logged when generating our new docs. The long term goal is to
get this list down to 0 warnings, but I'll do it in multiple PRs.

* satisfy doclint

new-docs/puppeteer.productlauncher.launch.md

@@ -0,0 +1,22 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [ProductLauncher](./puppeteer.productlauncher.md) &gt; [launch](./puppeteer.productlauncher.launch.md)
+
+## ProductLauncher.launch() method
+
+<b>Signature:</b>
+
+```typescript
+launch(object: any): any;
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  object | any |  |
+
+<b>Returns:</b>
+
+any
+