Fix Vale issues for planned_failover_single_node.md

doc/administration/geo/disaster_recovery/runbooks/planned_failover_single_node.md

@@ -19,7 +19,7 @@ This runbook is in **alpha**. For complete, production-ready documentation, see
 | Geo site    | Single-node     |
 | Secondaries | One             |
 
-This runbook will guide you through a planned failover of a single-node Geo site
+This runbook guides you through a planned failover of a single-node Geo site
 with one secondary. The following general architecture is assumed:
 
 ```mermaid
@@ -34,7 +34,7 @@ graph TD
   end
 ```
 
-This guide will result in the following:
+This guide results in the following:
 
 1. An offline primary.
 1. A promoted secondary that is now the new primary.
@@ -61,7 +61,7 @@ time to complete.
 
 If any objects are failing to replicate, this should be investigated before
 scheduling the maintenance window. After a planned failover, anything that
-failed to replicate will be **lost**.
+failed to replicate is **lost**.
 
 You can use the
 [Geo status API](../../../../api/geo_nodes.md#retrieve-project-sync-or-verification-failures-that-occurred-on-the-current-node)
@@ -102,10 +102,10 @@ follow these steps to avoid unnecessary data loss:
       sudo iptables -A INPUT --tcp-dport 443 -j REJECT
       ```
 
-      From this point, users will be unable to view their data or make changes on the
-      **primary** node. They will also be unable to log in to the **secondary** node.
-      However, existing sessions will work for the remainder of the maintenance period, and
-      public data will be accessible throughout.
+      From this point, users are unable to view their data or make changes on the
+      **primary** node. They are also unable to log in to the **secondary** node.
+      However, existing sessions need to work for the remainder of the maintenance period, and
+      so public data is accessible throughout.
 
    1. Verify the **primary** node is blocked to HTTP traffic by visiting it in browser via
       another IP. The server should refuse connection.
@@ -155,8 +155,8 @@ follow these steps to avoid unnecessary data loss:
       1. [Run an integrity check](../../../raketasks/check.md) to verify the integrity
          of CI artifacts, LFS objects, and uploads in file storage.
 
-   At this point, your **secondary** node will contain an up-to-date copy of everything the
-   **primary** node has, meaning nothing will be lost when you fail over.
+   At this point, your **secondary** node contains an up-to-date copy of everything the
+   **primary** node has, meaning nothing is lost when you fail over.
 
 1. In this final step, you need to permanently disable the **primary** node.
 
@@ -198,7 +198,7 @@ follow these steps to avoid unnecessary data loss:
 
    - If you do not have SSH access to the **primary** node, take the machine offline and
      prevent it from rebooting. Since there are many ways you may prefer to accomplish
-     this, we will avoid a single recommendation. You may need to:
+     this, we avoid a single recommendation. You may need to:
 
      - Reconfigure the load balancers.
      - Change DNS records (for example, point the **primary** DNS record to the
@@ -240,7 +240,7 @@ To promote the secondary node:
 
 1. Run the following command to list out all preflight checks and automatically
    check if replication and verification are complete before scheduling a planned
-   failover to ensure the process will go smoothly:
+   failover to ensure the process goes smoothly:
 
    NOTE:
    In GitLab 13.7 and earlier, if you have a data type with zero items to sync,