dashboard, env/linux-ppc64le/osuosl: update notes

The VM's have had more resources allocated, and been updated to
use an Ubuntu 20.04 base and container image.

Also, update the related notes/ownership on the dashboard.

Change-Id: Ibc227446e1950366933d937de6a9a9bf44d34532
Reviewed-on: https://go-review.googlesource.com/c/build/+/439675
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index b690bbb..2ec1f42 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -388,14 +388,16 @@
 		HermeticReverse: true,
 	},
 	"host-linux-ppc64le-osu": {
-		Notes:           "Debian Buster; run by Go team on osuosl.org; see x/build/env/linux-ppc64le/osuosl",
+		Notes:           "Ubuntu 20.04; run by Go team on osuosl.org; see x/build/env/linux-ppc64le/osuosl",
+		Owners:          []*gophers.Person{gh("pmur")},
 		IsReverse:       true,
 		ExpectNum:       5,
 		SSHUsername:     "root",
 		HermeticReverse: true,
 	},
 	"host-linux-ppc64le-power9-osu": {
-		Notes:           "Debian Buster; run by Go team on osuosl.org; see x/build/env/linux-ppc64le/osuosl",
+		Notes:           "Ubuntu 20.04; run by Go team on osuosl.org; see x/build/env/linux-ppc64le/osuosl",
+		Owners:          []*gophers.Person{gh("pmur")},
 		IsReverse:       true,
 		env:             []string{"GOPPC64=power9"},
 		SSHUsername:     "root",
diff --git a/env/linux-ppc64le/osuosl/NOTES b/env/linux-ppc64le/osuosl/NOTES
index 34a1b81..32b42ab 100644
--- a/env/linux-ppc64le/osuosl/NOTES
+++ b/env/linux-ppc64le/osuosl/NOTES
@@ -1,7 +1,7 @@
 The linux-ppc64le buildlets run on PPC64 VMs at osuosl.org (OSU Open Source Lab).
 
-They run Ubuntu bionic on the host, with Docker images running
-debian:buster running the buildlets.
+They run Ubuntu 20.04 on the host, with buildlets running inside an
+Ubuntu 20.04 container.
 
 Filing tickets: https://support.osuosl.org/
     Ticket username: bradfitz@golang.org
@@ -9,14 +9,14 @@
 
 Machines:
 
-* go-le-bionic-1: (20 GB RAM, 50 GB disk, 10 cores, POWER9)
-  Linux go-le-bionic-1 4.15.0-65-generic #74-Ubuntu SMP Tue Sep 17 17:08:54 UTC 2019 ppc64le ppc64le ppc64le GNU/Linux
+* go-le-bionic-1: (30 GB RAM, 50 GB disk, 20 cores, POWER9)
+  Linux go-le-bionic-2 5.4.0-125-generic #141-Ubuntu SMP Wed Aug 10 13:41:48 UTC 2022 ppc64le ppc64le ppc64le GNU/Linux
 
   ssh -i ~/.ssh/id_ed25519_golang1 ubuntu@140.211.169.171
   (key from go/go-builders-ssh)
 
-* go-le-bionic-2: (20 GB RAM, 50 GB disk, 10 cores, POWER8)
-  Linux go-le-bionic-2 4.15.0-65-generic #74-Ubuntu SMP Tue Sep 17 17:08:54 UTC 2019 ppc64le ppc64le ppc64le GNU/Linux
+* go-le-bionic-2: (30 GB RAM, 50 GB disk, 20 cores, POWER8)
+  Linux go-le-bionic-2 5.4.0-125-generic #141-Ubuntu SMP Wed Aug 10 13:41:48 UTC 2022 ppc64le ppc64le ppc64le GNU/Linux
 
   ssh -i ~/.ssh/id_ed25519_golang1 ubuntu@140.211.169.160
   (key from go/go-builders-ssh)
diff --git a/internal/releasetargets/releases.txt b/internal/releasetargets/releases.txt
index 5c6a8c8..6960eb8 100644
--- a/internal/releasetargets/releases.txt
+++ b/internal/releasetargets/releases.txt
@@ -32,7 +32,7 @@
 
 linux-ppc64le   linux      ppc64le    linux-ppc64le-buildlet
 	Build only
-	Running on reverse builder: Debian Buster; run by Go team on osuosl.org; see x/build/env/linux-ppc64le/osuosl
+	Running on reverse builder: Ubuntu 20.04; run by Go team on osuosl.org; see x/build/env/linux-ppc64le/osuosl
 
 linux-s390x     linux      s390x      linux-s390x-crosscompile
 	Build only
@@ -84,7 +84,7 @@
 
 linux-ppc64le   linux      ppc64le    linux-ppc64le-buildlet
 	Build only
-	Running on reverse builder: Debian Buster; run by Go team on osuosl.org; see x/build/env/linux-ppc64le/osuosl
+	Running on reverse builder: Ubuntu 20.04; run by Go team on osuosl.org; see x/build/env/linux-ppc64le/osuosl
 
 linux-s390x     linux      s390x      linux-s390x-crosscompile
 	Build only