BCDA-7332: update PACA user guide (#183)

## 🎫 Ticket

https://jira.cms.gov/browse/BCDA-7332

## 🛠 Changes

- update PACA user guide 

## ℹ️ Context for reviewers

- new user guide should be linked from user guide page 


https://github.com/CMSgov/bcda-static-site/assets/14364118/ed59c4e7-bec7-4c13-afc6-0e99800b7ab6


## ✅ Acceptance Validation

- assert that the user can view:
https://app.box.com/file/1282441965098?sb=/activity/versions/1401895878698
when attempting to navigate to user guide download link

## 🔒 Security Implications

- [ ] This PR adds a new software dependency or dependencies.
- [ ] This PR modifies or invalidates one or more of our security
controls.
- [ ] This PR stores or transmits data that was not stored or
transmitted before.
- [ ] This PR requires additional review of its security implications
for other reasons.

If any security implications apply, add Jason Ashbaugh (GitHub username:
StewGoin) as a reviewer and do not merge this PR without his approval.

_includes/partial/user_guide.html

@@ -1,4 +1,4 @@
 <div>
-  <p>The BCDA Partially Adjudicated Claims User Guide contains information found on this page and additional useful information for REACH ACOs. You can download the User Guide <a href="/assets/data/BCDA_Partially_Adjudicated_Claims_Enhancement_User_Guide_v1.0.0.pdf" target="blank" class="in-text__link">here</a>.
+  <p>The BCDA Partially Adjudicated Claims User Guide contains information found on this page and additional useful information for REACH ACOs. You can download the User Guide <a href="/assets/data/BCDA_Partially_Adjudicated_Claims_Enhancement_User_Guide_v1.2.0.pdf" target="blank" class="in-text__link">here</a>.
   </p>
 </div>