DOCSP-42881 Add GCP to Atlas Gov features matrix

Author: pierwill

source/includes/feature-matrix.rst

@@ -22,6 +22,10 @@
      -
      - :icon-fa5:`check`
 
+   * - GCP Assured Workloads
+     -
+     - :icon-fa5:`check`
+       
    * - Cross-region clusters
      - :icon-fa5:`check`
      - :icon-fa5:`check` [#cross-region]_
@@ -120,4 +124,4 @@
 .. [#govcloud-backup]
 
    |cloudgov-short| backups for |aws-fr-high| deployments are stored 
-   in |aws-fr-high| regions.
+   in |aws-fr-high| regions.