update links and flash error copy (#9703)

# Small copy / url updates

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

Co-authored-by: Jacob Shandling <jacob@fleetdm.com>

frontend/pages/admin/IntegrationsPage/cards/Mdm/Mdm.tsx

@@ -117,7 +117,7 @@ const Mdm = (): JSX.Element => {
     } else {
       renderFlash(
         "error",
-        "Your MDM business manager keys could not be downloaded. Please TODO ACTION."
+        "Your MDM business manager keys could not be downloaded. Please try again."
       );
     }
     return false;
@@ -162,7 +162,11 @@ const Mdm = (): JSX.Element => {
             </p>
             <p>
               5. Deploy Fleet with <b>mdm</b> configuration.{" "}
-              <CustomLink url="https://www.youtube.com" text="See how" newTab />
+              <CustomLink
+                url="https://fleetdm.com/docs/deploying/configuration#mobile-device-management-mdm"
+                text="See how"
+                newTab
+              />
             </p>
           </div>
         </>
@@ -225,7 +229,7 @@ const Mdm = (): JSX.Element => {
             <p>
               4. Deploy Fleet with <b>mdm</b> configuration.{" "}
               <CustomLink
-                url="https://business.apple.com/"
+                url="https://fleetdm.com/docs/deploying/configuration#mobile-device-management-mdm"
                 text="See how"
                 newTab
               />