docs: fix typos in comments and documentation across core codebase

[Avinash Shrivastava (AvinashShrivastav)]

Description

This PR fixes several small typos in JSDoc comments, inline code documentation, and unit test variables across src/vs/ and built-in extensions to improve code clarity and documentation quality:

• src/vs/base/browser/ui/splitview/splitview.ts: Fix typo referene -> reference in inline comment.
• src/vs/base/browser/ui/hover/hoverDelegateFactory.ts: Fix phrasing requires the them to dispose it -> requires them to dispose it.
• src/vs/editor/contrib/snippet/browser/snippet.md: Fix duplicate word with with -> with.
• src/vs/editor/contrib/inlineCompletions/browser/telemetry.ts: Fix duplicate word The the plan -> The plan.
• src/vs/editor/contrib/parameterHints/test/browser/parameterHintsModel.test.ts: Fix parameter label variable typos paramter -> parameter.
• src/vs/workbench/contrib/welcomeGettingStarted/browser/gettingStarted.ts: Fix phrasing Ensure that the these -> Ensure that these.
• src/vs/workbench/api/common/extHostTypes.ts: Fix spelling seperate -> separate.
• src/vs/workbench/contrib/files/browser/views/explorerViewer.ts: Fix spelling seperately -> separately.
• src/vs/base/parts/sandbox/electron-browser/electronTypes.ts: Fix spelling superceded -> superseded.
• extensions/copilot/src/platform/networking/common/networking.ts: Fix JSDoc typo cancellation tokenf -> cancellation token.

Testing

• Verified all edits via git diff to ensure strictly non-functional documentation/comment fixes.
• No logical code or API contract changes were introduced.

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[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

Benjamin Christopher Simmonds (@benibenj)

Matched files:

• src/vs/base/browser/ui/splitview/splitview.ts

[Avinash Shrivastava (AvinashShrivastav)]

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