fix: small text changes

[kiram15]

With the release of Groups, the budget distribution mode text needs to be updated. For ‘Learner selects content or LMS', it should be ‘Browse and Enroll or LMS’. For ‘Admin selects content’, it should be 'Admin assign’

Jira ticket

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.34%. Comparing base (da37a62) to head (dbec11c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #390      +/-   ##
==========================================
- Coverage   88.35%   88.34%   -0.02%     
==========================================
  Files         164      164              
  Lines        3462     3467       +5     
  Branches      856      861       +5     
==========================================
+ Hits         3059     3063       +4     
- Misses        399      400       +1     
  Partials        4        4              

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