* Moved annotation and labels topic to fundamentals and added label matching to the same section
* Cosmetic updates to "How label matching works topic"
* Few more changes to annotations and label section. Also added stem sentence to silences topics.
* Fixed one more broken relref.
* Update docs/sources/alerting/fundamentals/_index.md
Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
