docs: enhance upgrade version steps (#1228)

Co-authored-by: Joyce Fee <102751339+Feediver1@users.noreply.github.com>

Author: paulohtb6

modules/upgrade/partials/rolling-upgrades/restart-the-broker.adoc

@@ -1,3 +1,8 @@
 === Restart the broker
 
-Restart the broker's Redpanda service with xref:reference:rpk/rpk-redpanda/rpk-redpanda-stop.adoc[`rpk redpanda stop`], then xref:reference:rpk/rpk-redpanda/rpk-redpanda-start.adoc[`rpk redpanda start`].
+To ensure proper ownership and permissions, restart the broker's Redpanda service using `systemctl`:
+
+[,bash]
+----
+sudo systemctl restart redpanda
+----

modules/upgrade/partials/rolling-upgrades/upgrade-your-version.adoc

@@ -11,21 +11,43 @@ For Linux distributions, the process changes according to the distribution:
 ====
 Fedora/RedHat::
 +
-In the terminal, run:
+First, check which versions are available and verify your current version:
 +
 [,bash]
 ----
-sudo yum update redpanda
+# List available versions
+yum list --showduplicates redpanda
+
+# Check current version
+rpk redpanda admin brokers list
+----
++
+Install the specific version you want to upgrade to. Replace `<version>` with the desired version:
++
+[,bash]
+----
+sudo yum update redpanda-<version> # example: redpanda-25.1.7-1
 ----
 
 Debian/Ubuntu::
 +
-In the terminal, run:
+First, check which versions are available and verify your current version:
++
+[,bash]
+----
+# List available versions
+apt list --all-versions redpanda
+
+# Check current version
+rpk redpanda admin brokers list
+----
++
+Install the specific version you want to upgrade to. Replace `<version>` with the desired version (for example, `25.1.7-1`):
 +
 [,bash]
 ----
 sudo apt update
-sudo apt install redpanda
+sudo apt install redpanda=<version> # example: redpanda-25.1.7-1
 ----
 
 ====