docs: remove obsolete "larger than three" from TextEditor.viewColumn

[AManWhoCodes (amanx5)]

Fixes #335331

Description

In src/vscode-dts/vscode.d.ts, the JSDoc for TextEditor.viewColumn states:

/**
 * The column in which this editor shows. Will be `undefined` in case this
 * isn't one of the main editors, e.g. an embedded editor, or when the editor
 * column is larger than three.
 */
readonly viewColumn: ViewColumn | undefined;

The clause "or when the editor column is larger than three" is outdated legacy text from May 2018 (PR #49599) when ViewColumn only defined values up to Three.

As verified in #52315, textEditor.viewColumn is defined for any column in the grid layout, and ViewColumn.to(position) converts any EditorGroupColumn >= 0 to a ViewColumn. viewColumn is only undefined when the editor is not placed in a main editor group (e.g. embedded editors in Peek Views, inline widgets).

This PR removes the obsolete phrase.

[Copilot]

Copilot wasn't able to review any files in this pull request.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.