Revert "deprecate IObserver options and its properties in JSDoc (#3939

)"

This reverts commit 51354c2.

packages/mobx-react-lite/src/observer.ts

@@ -18,27 +18,13 @@ const ReactMemoSymbol = hasSymbol
     ? Symbol.for("react.memo")
     : typeof memo === "function" && memo((props: any) => null)["$$typeof"]
 
-/**
- * @deprecated Observer options will be removed in the next major version of mobx-react-lite.
- * Look at the individual properties for alternatives.
- */
 export interface IObserverOptions {
-    /**
-     * @deprecated Pass a `React.forwardRef` component to observer instead of using the options object
-     * e.g. `observer(React.forwardRef(fn))`
-     */
     readonly forwardRef?: boolean
 }
 
 export function observer<P extends object, TRef = {}>(
     baseComponent: React.ForwardRefRenderFunction<TRef, P>,
-    options: IObserverOptions & {
-        /**
-         * @deprecated Pass a `React.forwardRef` component to observer instead of using the options object
-         * e.g. `observer(React.forwardRef(fn))`
-         */
-        forwardRef: true
-    }
+    options: IObserverOptions & { forwardRef: true }
 ): React.MemoExoticComponent<
     React.ForwardRefExoticComponent<React.PropsWithoutRef<P> & React.RefAttributes<TRef>>
 >