[PATCH docs 4/4] docs: various small grammar fixes

[Kefu Chai <k.chai@proxmox.com>]

Small grammar fixes spotted during a proofreading pass of the
Ceph-related chapters:

* hyper-converged-infrastructure: drop stray article in "a both
  self-healing..." and split "Checkout" into "Check out".
* pve-package-repos: "an selected update" -> "a selected update".
* pve-storage-rbd: "is recommend" -> "is recommended".

Signed-off-by: Kefu Chai <k.chai@proxmox.com>
---
 hyper-converged-infrastructure.adoc | 4 ++--
 pve-package-repos.adoc              | 2 +-
 pve-storage-rbd.adoc                | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/hyper-converged-infrastructure.adoc b/hyper-converged-infrastructure.adoc
index 4616392..cc6199c 100644
--- a/hyper-converged-infrastructure.adoc
+++ b/hyper-converged-infrastructure.adoc
@@ -48,8 +48,8 @@ Hyper-Converged Infrastructure: Storage
 infrastructure. You can, for example, deploy and manage the following two
 storage technologies by using the web interface only:
 
-- *Ceph*: a both self-healing and self-managing shared, reliable and highly
-  scalable storage system. Checkout
+- *Ceph*: a self-healing and self-managing shared, reliable and highly
+  scalable storage system. Check out
   xref:chapter_pveceph[how to manage Ceph services on {pve} nodes]
 
 - *ZFS*: a combined file system and logical volume manager with extensive
diff --git a/pve-package-repos.adoc b/pve-package-repos.adoc
index a2882a8..2091ff6 100644
--- a/pve-package-repos.adoc
+++ b/pve-package-repos.adoc
@@ -10,7 +10,7 @@ package management tool like any other Debian-based system.
 
 {pve} automatically checks for package updates on a daily basis. The `root@pam`
 user is notified via email about available updates. From the GUI, the
-'Changelog' button can be used to see more details about an selected update.
+'Changelog' button can be used to see more details about a selected update.
 
 Repositories in {pve}
 ~~~~~~~~~~~~~~~~~~~~~
diff --git a/pve-storage-rbd.adoc b/pve-storage-rbd.adoc
index 5fe558a..9a52974 100644
--- a/pve-storage-rbd.adoc
+++ b/pve-storage-rbd.adoc
@@ -102,7 +102,7 @@ The keyring will be stored at
 # /etc/pve/priv/ceph/<STORAGE_ID>.keyring
 ----
 
-TIP: Creating a keyring with only the needed capabilities is recommend when
+TIP: Creating a keyring with only the needed capabilities is recommended when
 connecting to an external cluster. For further information on Ceph user
 management, see the Ceph docs.footnoteref:[cephusermgmt,{cephdocs-url}/rados/operations/user-management/[Ceph User Management]]
 
-- 
2.47.3