(DOCSP-47155) Updates button name.-v6.0-backport (740) (#743)

# Backport

This will backport the following commits from `master` to `v6.0`:
- [(DOCSP-47155) Updates button name.
(#740)](10gen/docs-ops-manager#740)

<!--- Backport version: 9.6.2 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

Author: erabil-mdb

source/includes/steps-source-upgrade-onprem.yaml

@@ -38,7 +38,7 @@ content: |
   |onprem| displays a banner that says :guilabel:`One or more agents
   are out of date`.
 
-  Click :guilabel:`Update All Agents`, then confirm the changes.
+  Click :guilabel:`Update Software Components`, then confirm the changes.
 
   .. important::