fix: fixed url break issue

[sundasnoreen12]

INF-1655

Description

Fixed the broken link to notifications documentation on the preferences page.

Merge Checklist

• If your update includes visual changes, have they been reviewed by a designer? Send them a link to the Sandbox, if applicable.
• Is there adequate test coverage for your changes?

Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/edx-infinity to do it.
• 🎉 🙌 Celebrate! Thanks for your contribution.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.53%. Comparing base (a9f061f) to head (b094722).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1165   +/-   ##
=======================================
  Coverage   58.53%   58.53%           
=======================================
  Files         117      117           
  Lines        2320     2320           
  Branches      644      641    -3     
=======================================
  Hits         1358     1358           
  Misses        901      901           
  Partials       61       61           

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