Apply a Predefined Theme - Wrong instructions

[JaneSjs]

User Issue: T14916 - Switching between default themes in Angular
https://surveyjs.answerdesk.io/internal/ticket/details/T14916

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Please update this topic:

survey-library/docs/manage-default-themes-and-styles.md

Line 23 in 1ad67ed

## Apply a Predefined Theme

To apply a predefined theme, it is necessary to import defaultV2.css, import a Theme module, and call the survey.applyTheme(Theme) function.

import "survey-core/defaultV2.min.css";
import BorderlessDark from "survey-core/themes/borderless-dark.js";
import DoubleBorderLight from "survey-core/themes/doubleborder-light.js";

survey.applyTheme(DoubleBorderLight);

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