Go through the developer docs and updates all broken links to FAQs to the correct links

[mattab]

For example in https://developer.matomo.org/guides/tracking-javascript
we have a link to https://matomo.org/faq/how-to/#faq_187 (not working)
instead it should link to https://matomo.org/faq/how-to/faq_187/ (working)

Maybe it would be simple enough to search in the codebase for all URLs matching https://matomo.org/faq/how-to/# and replace them simply with https://matomo.org/faq/how-to/?