docs: refactor/doc slots

[MajesticPotatoe]

Description

Update docs and doc examples to use new slot syntax

Motivation and Context

Because slot life is best life
Closes #6440

How Has This Been Tested?

Visually, Lint

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and breaking changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)

[codecov]

Codecov Report

Merging #6502 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6502      +/-   ##
==========================================
+ Coverage   85.59%   85.59%   +<.01%     
==========================================
  Files         298      298              
  Lines        7162     7163       +1     
  Branches     1781     1782       +1     
==========================================
+ Hits         6130     6131       +1     
  Misses        942      942              
  Partials       90       90

Impacted Files	Coverage Δ
packages/vuetify/src/components/VIcon/VIcon.ts	100% <0%> (ø)	⬆️
...ages/vuetify/src/components/VCarousel/VCarousel.ts	91.66% <0%> (ø)	⬆️
packages/vuetify/src/mixins/menuable.js	88.8% <0%> (+0.18%)	⬆️

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resolved errors

[codecov]

Codecov Report

Merging #6502 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6502      +/-   ##
==========================================
- Coverage   85.68%   85.68%   -0.01%     
==========================================
  Files         298      298              
  Lines        7175     7174       -1     
  Branches     1785     1785              
==========================================
- Hits         6148     6147       -1     
  Misses        936      936              
  Partials       91       91

Impacted Files	Coverage Δ
packages/vuetify/src/directives/ripple.ts	75.59% <0%> (-0.2%)	⬇️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[lock]

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