Change APT/YUM urls to point to the prerelease repositories

Closes #20593

docs/reference/setup/install/deb.asciidoc

@@ -33,7 +33,7 @@ Save the repository definition to  +/etc/apt/sources.list.d/elastic-{major-versi
 
 ["source","sh",subs="attributes,callouts"]
 --------------------------------------------------
-echo "deb https://artifacts.elastic.co/packages/{major-version}/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-{major-version}.list
+echo "deb https://artifacts.elastic.co/packages/{major-version}-prerelease/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-{major-version}.list
 --------------------------------------------------
 
 [WARNING]

docs/reference/setup/install/rpm.asciidoc

@@ -34,7 +34,7 @@ OpenSuSE based distributions, containing:
 --------------------------------------------------
 [elasticsearch-{major-version}]
 name=Elasticsearch repository for {major-version} packages
-baseurl=https://artifacts.elastic.co/packages/{major-version}/yum
+baseurl=https://artifacts.elastic.co/packages/{major-version}-prerelease/yum
 gpgcheck=1
 gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
 enabled=1