[8.x] [Serverless bug bash] Fixes link ref on Install Elastic Defend …

…page (backport #6164) (#6208)

* Fixes link ref on Install Elastic Defend page (#6164)

(cherry picked from commit a6c3736)

# Conflicts:
#	docs/serverless/edr-install-config/install-elastic-defend.asciidoc

* Delete docs/serverless directory and its contents

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Co-authored-by: natasha-moore-elastic <137783811+natasha-moore-elastic@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

docs/getting-started/install-endpoint.asciidoc

@@ -20,7 +20,7 @@ Like other Elastic integrations, {elastic-defend} is integrated into the {agent}
 [[security-before-you-begin]]
 == Before you begin
 
-If you're using macOS, some versions may require you to grant Full Disk Access to different kernels, system extensions, or files. Refer to <<elastic-endpoint-deploy-reqs, requirements for {elastic-endpoint}>> for more information.
+If you're using macOS, some versions may require you to grant Full Disk Access to different kernels, system extensions, or files. Refer to <<elastic-endpoint-deploy-reqs>> for more information.
 
 NOTE: {elastic-defend} does not support deployment within an {agent} DaemonSet in Kubernetes.