Docs: Fix release-state check for oss repositories (#36120)

To get the newly added oss apt/yum sections to get rendered for
`released` and `prerelease` versions the condition needs to be modified.

docs/reference/setup/install/deb.asciidoc

@@ -105,7 +105,7 @@ endif::[]
 
 include::skip-set-kernel-parameters.asciidoc[]
 
-ifeval::["{release-state}"=="released"]
+ifeval::["{release-state}"!="unreleased"]
 
 [NOTE]
 ==================================================

docs/reference/setup/install/rpm.asciidoc

@@ -90,7 +90,7 @@ sudo zypper install elasticsearch <3>
 
 endif::[]
 
-ifeval::["{release-state}"=="released"]
+ifeval::["{release-state}"!="unreleased"]
 
 [NOTE]
 ==================================================