docs(troubleshooting.md): Update troubleshooting.md (#3606)

The proposal adds a drop-down list in a similar fashion as Dependencies list since it feels a little weird to have list for a continuing detail as I assume that all the three options belong to the same level of information.

docs/troubleshooting.md

@@ -79,10 +79,13 @@ xorg-x11-fonts-misc
 ```
 </details>
 
-- Check out discussions:
-  - [#290](https://github.com/GoogleChrome/puppeteer/issues/290) - Debian troubleshooting
-  - [#391](https://github.com/GoogleChrome/puppeteer/issues/391) - CentOS troubleshooting
-  - [#379](https://github.com/GoogleChrome/puppeteer/issues/379) - Alpine troubleshooting
+<details>
+  <summary>Check out discussions</summary>
+
+- [#290](https://github.com/GoogleChrome/puppeteer/issues/290) - Debian troubleshooting <br/>
+- [#391](https://github.com/GoogleChrome/puppeteer/issues/391) - CentOS troubleshooting <br/>
+- [#379](https://github.com/GoogleChrome/puppeteer/issues/379) - Alpine troubleshooting <br/>
+</details>
 
 ## Setting Up Chrome Linux Sandbox