fix(kbd): fix kbd background color

[dsseng]

Description

Change kbd background to $grey.darken-2

Motivation and Context

Fixes #5509.

How Has This Been Tested?

visually

Markup:

<template>
  <v-app>
    <v-container>
      <v-card dark>
        <v-card-text>
          im some card text<br>
          <kbd>im a kbd tag</kbd>
          <code>im a code tag</code>
        </v-card-text>
      </v-card>
      <v-card>
        <v-card-text>
          im some card text<br>
          <kbd>im a kbd tag</kbd>
          <code>im a code tag</code>
        </v-card-text>
      </v-card>
    </v-container>
  </v-app>
</template>

<script>
  export default {
    data: () => ({
    })
  }
</script>

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)

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[MajesticPotatoe]

Looks good. 👍
Thanks for the contribution.

[lock]

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