Fix typo from old code (microsoft#209557)

fix long standing typo

Author: Yoyokrazy

src/vs/workbench/contrib/notebook/browser/viewModel/notebookOutlineProvider.ts

@@ -20,7 +20,7 @@ import { CancellationToken } from 'vs/base/common/cancellation';
 import { NotebookOutlineEntryFactory } from 'vs/workbench/contrib/notebook/browser/viewModel/notebookOutlineEntryFactory';
 
 export class NotebookCellOutlineProvider {
-	private readonly _dispoables = new DisposableStore();
+	private readonly _disposables = new DisposableStore();
 	private readonly _onDidChange = new Emitter<OutlineChangeEvent>();
 
 	readonly onDidChange: Event<OutlineChangeEvent> = this._onDidChange.event;
@@ -54,7 +54,7 @@ export class NotebookCellOutlineProvider {
 		this._outlineEntryFactory = new NotebookOutlineEntryFactory(notebookExecutionStateService);
 
 		const selectionListener = new MutableDisposable();
-		this._dispoables.add(selectionListener);
+		this._disposables.add(selectionListener);
 
 		selectionListener.value = combinedDisposable(
 			Event.debounce<void, void>(
@@ -69,7 +69,7 @@ export class NotebookCellOutlineProvider {
 			)(this._recomputeState, this)
 		);
 
-		this._dispoables.add(_configurationService.onDidChangeConfiguration(e => {
+		this._disposables.add(_configurationService.onDidChangeConfiguration(e => {
 			if (e.affectsConfiguration(NotebookSetting.outlineShowMarkdownHeadersOnly) ||
 				e.affectsConfiguration(NotebookSetting.outlineShowCodeCells) ||
 				e.affectsConfiguration(NotebookSetting.outlineShowCodeCellSymbols) ||
@@ -79,11 +79,11 @@ export class NotebookCellOutlineProvider {
 			}
 		}));
 
-		this._dispoables.add(themeService.onDidFileIconThemeChange(() => {
+		this._disposables.add(themeService.onDidFileIconThemeChange(() => {
 			this._onDidChange.fire({});
 		}));
 
-		this._dispoables.add(notebookExecutionStateService.onDidChangeExecution(e => {
+		this._disposables.add(notebookExecutionStateService.onDidChangeExecution(e => {
 			if (e.type === NotebookExecutionType.cell && !!this._editor.textModel && e.affectsNotebook(this._editor.textModel?.uri)) {
 				this._recomputeState();
 			}
@@ -96,7 +96,7 @@ export class NotebookCellOutlineProvider {
 		this._entries.length = 0;
 		this._activeEntry = undefined;
 		this._entriesDisposables.dispose();
-		this._dispoables.dispose();
+		this._disposables.dispose();
 	}
 
 	init(): void {