Update iOS/iPadOS enrollment label to match Android copy

[kilo-code-bot]

Summary

• Changes the iOS/iPadOS Add Hosts modal label from "Send this to your end users:" to "Enrollment instructions:" to match the Android enrollment panel
• Updates the corresponding test assertion

Closes #42721

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.81%. Comparing base (7329c89) to head (6ddef4b).

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #42802    +/-   ##
========================================
  Coverage   66.81%   66.81%            
========================================
  Files        2541     2541            
  Lines      203971   203971            
  Branches     9278     9164   -114     
========================================
  Hits       136282   136282            
  Misses      55343    55343            
  Partials    12346    12346            

Flag	Coverage Δ
frontend	54.80% <ø> (ø)

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