[7.16] [DOCS] Fix link in Kibana Add Data (elastic#145480) (elastic#145489)

# Backport

This will backport the following commits from `main` to `7.16`:
- [[DOCS] Fix link in Kibana Add Data
(elastic#145480)](elastic#145480)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Fix link in Kibana Add Data
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Fix link in Kibana Add Data
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Fix link in Kibana Add Data
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Co-authored-by: Lisa Cawley <[email protected]>

Author: kibanamachine

docs/developer/best-practices/index.asciidoc

@@ -22,7 +22,7 @@ Are you planning with scalability in mind?
 
 Did you know {kib} makes a public statement about our commitment to
 creating an accessible product for people with disabilities?
-https://www.elastic.co/guide/en/kibana/master/accessibility.html[We do]!
+<<accessibility,We do>>!
 It’s very important all of our apps are accessible.
 
 * Learn how https://elastic.github.io/eui/#/guidelines/accessibility[EUI

docs/setup/connect-to-elasticsearch.asciidoc

@@ -13,7 +13,7 @@ All integrations are available in a single view, and
 image::images/add-integration.png[Integrations page from which you can choose integrations to start collecting and analyzing data]
 
 NOTE: When an integration is available for both
-https://www.elastic.co/guide/en/fleet/master/beats-agent-comparison.html[Elastic Agent and Beats],
+{fleet-guide}/beats-agent-comparison.html[Elastic Agent and Beats],
 the *Integrations* view defaults to the
 Elastic Agent integration, if it is generally available (GA).
 To show a