refactor: Rename update method to replaceData in DocumentReference

This commit renames the `update` method to `replaceData` in the `DocumentReference` class. The purpose of this change is to provide a more descriptive and accurate method name that reflects the behavior of replacing the entire data object with a new one. This change aligns with the recent refactoring of other methods in the `DocumentReference` class, such as `updatePartial` to `mergeItemData`, `remove` to `removeItem`, `append` to `appendItem`, `add` to `addItem`, `getItem` to `getItemData`, and `exists` to `itemExists`. The renaming of methods improves code readability and consistency.

BREAKING CHANGE: The `update` method has been replaced with `replaceData` in the `DocumentReference` class. Developers should update their code to use the new method name.

packages/reference/src/document-reference.ts

@@ -270,11 +270,11 @@ export class DocumentReference<TDoc extends JsonifiableObject = JsonifiableObjec
    *
    * @example
    * ```typescript
-   * documentRef.update({ a: 1, b: 2, c: 3 });
+   * documentRef.overwriteData({ a: 1, b: 2, c: 3 });
    * ```
    */
-  update(data: TDoc): void {
-    this.logger__.logMethodArgs?.('update', data);
+  replaceData(data: TDoc): void {
+    this.logger__.logMethodArgs?.('overwriteData', data);
     (this.context__.data as unknown) = data;
     this.updated__();
   }