/enroll page: Update copy

[noahtalerman]

• We use "BYO mobile" instead of "corporate mobile": https://docs.google.com/document/d/1aVZ_eAiUjq1pdltR5ckwcbOXKB0DMzmboWZlegqJXDk/edit?tab=t.0
• Decided to just go with "mobile" because that's more familiar to end users
• Context: https://fleetdm.slack.com/archives/C03C41L5YEL/p1774377975564699

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.67%. Comparing base (581cae3) to head (8cb1a67).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #42602      +/-   ##
==========================================
- Coverage   66.67%   66.67%   -0.01%     
==========================================
  Files        2534     2534              
  Lines      203223   203223              
  Branches     9231     9115     -116     
==========================================
- Hits       135499   135496       -3     
- Misses      55466    55468       +2     
- Partials    12258    12259       +1     

Flag	Coverage Δ
backend	68.50% <ø> (-0.01%)	⬇️
frontend	54.43% <ø> (ø)

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[ghernandez345]

Look good. I think the failed tests can be ignored. not related to your changes.