Fix for ButtonKit & Signals Docs

[e60m5ss]

I've changed two files.

• ButtonKit Documentation: I made comments start with capital letters.
• Signals Documentation: In the previous documentation, both CommonJS, ESM, and TypeScript examples used TypeScript code (e.g. ActionRowBuilder in the JS docs), so I fixed that. I've also changed comments for more consistency.

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[notunderctrl]

For using-signals.mdx: Instead of variable names such as disposeValue and disposeCount, I think names such as disposeValueSubscribers and disposeCountSubscribers would be more descriptive.

[e60m5ss]

For using-signals.mdx: Instead of variable names such as disposeValue and disposeCount, I think names such as disposeValueSubscribers and disposeCountSubscribers would be more descriptive.

Okay, I'll rename them.

[e60m5ss]

@notunderctrl I've renamed the variables to use the better names you've suggested. A review would be appreciated.