Refactor help text in scripts page

[thisisjoegrant]

Related issue: Resolves #50790

Checklist for submitter

If some of the following don't apply, delete the relevant line.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.

Testing

• QA'd all new/changed functionality manually

[codecov]

Codecov Report

❌ Patch coverage is 64.70588% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.53%. Comparing base (9cb3a5e) to head (3c7c402).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...mponents/ScriptDetailsModal/ScriptDetailsModal.tsx	0.00%	3 Missing ⚠️
.../hosts/details/HostDetailsPage/HostDetailsPage.tsx	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #50815    +/-   ##
========================================
  Coverage   68.52%   68.53%            
========================================
  Files        3977     3976     -1     
  Lines      256095   256085    -10     
  Branches    13780    13615   -165     
========================================
+ Hits       175490   175502    +12     
+ Misses      64987    64966    -21     
+ Partials    15618    15617     -1     

Flag	Coverage Δ
frontend	62.76% <64.70%> (+0.04%)	⬆️

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