Minor docs PR (#2496)

* Add custom tls certs page to docs 
* Add more detail about internet connection timeout, DNS rebinding to FAQ
* Make sure global gitignore ignores *-compose-full.yaml

cmd/ddev/cmd/global_dotddev_assets/.gitignore

@@ -6,6 +6,7 @@
 /global_config.yaml
 /pantheon*
 /*compose.yaml
+/*compose-full.yaml
 /.sshimageBuild
 /.update
 /testcache

docs/users/faq.md

@@ -34,4 +34,4 @@
     * Use project type "php" instead of the type of your CMS. "php" just means "Don't try to create settings files and such for me.". The "php" type works great for experienced developers.
     * "Take over" the settings file or .gitignore by deleting the line "#ddev-generated" in it (and then check in the file). If that line is removed, ddev will not try to replace or change the file.
 
-* **I see "Internet connection not detected" and DDEV-Local wants to add a hostname to /etc/hosts. But my internet is working!** ddev uses the ability to do a DNS lookup of <somethingrandom>.ddev.site as a proxy for whether you're connected to the internet, and it guesses that it ought to be able to complete that in about 750ms or maybe the internet isn't available. If it finds no internet, it will try to create entries in /etc/hosts, since it's assuming you can't use *.ddev.site via DNS. If your internet is actually working, but DNS is slow, just `ddev config global --internet-detection-timeout-ms=3000` to set the timeout to 3 seconds. See[issue link](https://github.com/drud/ddev/issues/2409#issuecomment-662448025) for more details.
+* **I see "Internet connection not detected" and DDEV-Local wants to add a hostname to /etc/hosts. But my internet is working!** ddev uses the ability to do a DNS lookup of <somethingrandom>.ddev.site as a proxy for whether you're connected to the internet, and it guesses that it ought to be able to complete that in about 750ms or maybe the internet isn't available. If it finds no internet, it will try to create entries in /etc/hosts, since it's assuming you can't use *.ddev.site via DNS. If your internet is actually working, but DNS is slow, just `ddev config global --internet-detection-timeout-ms=3000` to set the timeout to 3 seconds. See[issue link](https://github.com/drud/ddev/issues/2409#issuecomment-662448025) for more details. (If DNS rebinding is disallowed on your network, this won't be solvable without network changes. Help [here](https://github.com/drud/ddev/issues/2409#issuecomment-675083658) and [here](https://github.com/drud/ddev/issues/2409#issuecomment-686718237).)

mkdocs.yml

@@ -33,6 +33,7 @@ pages:
     - 'Customizing Docker Images': 'users/extend/customizing-images.md'
     - 'Custom Commands': 'users/extend/custom-commands.md'
     - 'In-container Configuration': 'users/extend/in-container-configuration.md'
+    - 'Custom TLS Certificates': 'users/extend/custom-tls-certificates.md'
   - 'Integration with Hosting Providers':
     - 'Pantheon': 'users/providers/pantheon.md'
     - 'DDEV-Live': 'users/providers/DDEV-Live.md'