style: Update some texts in legacy libraries migration flow [FC-0112]

[ChrisChV]

Description

• Updates the text described in Update Migration Library Selection Text #2582 (comment)
• Which user roles will this change impact? "Course Author"

Supporting information

• Github issue: Update Migration Library Selection Text #2582 (comment)
• Internal ticket: FAL-4270

Testing instructions

• Go to the legacy libraries migration flow.
• Select one legacy library
• On the destination view, verify the updated text in the alert.
• On the confirmation view, verify the updated text in the alert.

Other information

N/A

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Avoid propTypes and defaultProps in any new or modified code.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks)
• Do not add new fields to the Redux state/store. Use React Context to share state among multiple components.
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Avoid using ../ in import paths. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

[openedx-webhooks]

Thanks for the pull request, @ChrisChV!

This repository is currently maintained by @bradenmacdonald.

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[ChrisChV]

Hi @bradenmacdonald, could you review this small PR?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.82%. Comparing base (436ac31) to head (2bbbc88).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #2601    +/-   ##
========================================
  Coverage   94.82%   94.82%            
========================================
  Files        1226     1226            
  Lines       27557    27557            
  Branches     6043     6227   +184     
========================================
  Hits        26131    26131            
+ Misses       1368     1355    -13     
- Partials       58       71    +13     

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[bradenmacdonald]

👍

• I tested this: opened the migration flow and saw the new text
• I read through the code
• I checked for accessibility issues
• Includes documentation: n/a