chore: E2EE setting warning update

[hugocostadev]

Proposed changes (including videos or screenshots)

The warning related to E2EE must be updated, given the new features we are including in 6.10;

It was removed:

• The mobile apps may not support the encrypted messages (they are implementing it).
• Uploads will not be encrypted in this version.

Issue(s)

Steps to test or reproduce

Further comments

https://rocketchat.atlassian.net/browse/E2EE2-34

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.73%. Comparing base (79c16d3) to head (b0f1f92).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #33224   +/-   ##
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  Coverage    59.73%   59.73%           
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  Files         2548     2548           
  Lines        63073    63073           
  Branches     14090    14090           
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  Hits         37679    37679           
  Misses       22978    22978           
  Partials      2416     2416           

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