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.launchoptions.pipe.md

@@ -0,0 +1,11 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [LaunchOptions](./puppeteer.launchoptions.md) &gt; [pipe](./puppeteer.launchoptions.pipe.md)
+
+## LaunchOptions.pipe property
+
+<b>Signature:</b>
+
+```typescript
+pipe?: boolean;
+```