`Workspace.getLeafById` is mistyped

[RyotaUshio]

The documentation (https://docs.obsidian.md/Reference/TypeScript+API/Workspace/getLeafById) says

getLeafById(id: string): WorkspaceLeaf;

But if id is just a random string, it returns null. So instead it should be

getLeafById(id: string): WorkspaceLeaf | null;

[joethei]

Thanks

[joethei]

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