fix: update copy in VPP/ABM UI (#21730)

> Related issue: #21723

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

<!-- Note that API documentation changes are now addressed by the
product design team. -->

- [x] Manual QA for all new/changed functionality

frontend/pages/SoftwarePage/components/AppStoreVpp/AppStoreVpp.tsx

@@ -38,11 +38,11 @@ const EnableVppCard = () => {
           <b>Volume Purchasing Program (VPP) isn&apos;t enabled</b>
         </p>
         <p className={`${baseClass}__enable-vpp-description`}>
-          To add App Store apps, first enable VPP.
+          To add App Store apps, first add VPP.
         </p>
         <CustomLink
           url={PATHS.ADMIN_INTEGRATIONS_VPP}
-          text="Enable VPP"
+          text="Add VPP"
           className={`${baseClass}__enable-vpp-link`}
         />
       </div>

frontend/pages/admin/IntegrationsPage/cards/MdmSettings/components/AutomaticEnrollmentSection/AppleAutomaticEnrollmentCard/AppleAutomaticEnrollmentCard.tsx

@@ -25,7 +25,7 @@ const AppleAutomaticEnrollmentCard = ({
       "Add an Apple Business Manager (ABM) connection to automatically enroll newly " +
       "purchased Apple hosts when they're first unboxed and set up by your end users.";
   } else if (isAppleMdmOn && configured) {
-    msg = "Automatic enrollment for Apple (macOS, iOS, iPadOS) hosts enabled.";
+    msg = "Automatic enrollment for Apple (macOS, iOS, iPadOS) is enabled.";
     icon = "success";
   }
 

frontend/pages/admin/IntegrationsPage/cards/MdmSettings/components/VppSection/VppSection.tsx

@@ -46,7 +46,7 @@ const VppCard = ({ isAppleMdmOn, isVppOn, router }: IVppCardProps) => {
       <p>
         <span>
           <Icon name="success" />
-          Volume Purchasing Program (VPP) enabled.
+          Volume Purchasing Program (VPP) is enabled.
         </span>
       </p>
       <Button onClick={navigateToVppSetup} variant="text-icon">