Update email and text templates for Domain Claimed by Organization no…

[JaredScar]

…tification

• Changed the heading to "What this means for you" for clarity.
• Revised bullet points to better reflect user experience and responsibilities within the organization.
• Updated the phrasing of the help article reference for consistency.

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-31153

📔 Objective

Update the email text for domain claiming by an organization

📸 Screenshots

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – 5a51a7ae-9c19-4fde-8bdb-74da6daa10af

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.07%. Comparing base (afb0871) to head (69c4e77).

Files with missing lines	Patch %	Lines
src/Core/Platform/Mail/HandlebarsMailService.cs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6897      +/-   ##
==========================================
- Coverage   56.07%   56.07%   -0.01%     
==========================================
  Files        1968     1968              
  Lines       86963    86963              
  Branches     7746     7746              
==========================================
- Hits        48765    48764       -1     
- Misses      36393    36394       +1     
  Partials     1805     1805              

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