docs(voice): add DAVE dependency section

[jNullj]

Please describe the changes this PR makes and why it should be merged:

Support for DAVE protocol was added at #10735
Discord mention this in a past blog post here and it seems like this is about to be a requirement.
As I discovered while I got repeated crashes due to discord not downgrading my connection to a non e2ee connection!
It could be very useful if i known about this dependency while searching for a solution.
It could be also a good idea to inform users in the release notes/changelog so they know it's a good idea to add this dependency.

Made another PR for the guide as well #11145

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR only includes non-code changes, like changes to documentation, README, etc.

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2 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
discord-js	Ignored	Preview		Oct 11, 2025 6:28pm
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.08%. Comparing base (0c2975e) to head (ca88f99).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11061      +/-   ##
==========================================
- Coverage   44.19%   44.08%   -0.11%     
==========================================
  Files         313      310       -3     
  Lines       18093    17659     -434     
  Branches     1796     1744      -52     
==========================================
- Hits         7996     7785     -211     
+ Misses      10085     9862     -223     
  Partials       12       12              

Flag	Coverage Δ
voice	60.25% <ø> (ø)

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