Corrections in import-export

Current: Modern build tools, such as webpack and others, bundle modules together and optimize them to speedup loading. They also removed unused imports.
Expected: Modern build tools, such as webpack and others, bundle modules together and optimize them to speedup loading. They also remove unused imports.

Current: For instance, if you import * as library from a huge code library, and then use only few methods, then unused ones will not be included into the optimzed bundle.
Expected: For instance, if you import * as library from a huge code library, and then use only few methods, then unused ones will not be included into the optimized bundle.

定位包含 webpack 示例的导入导出文档段落，并比较此 issue 中当前的措辞和预期措辞。更正动词时态和“optimized”的拼写，然后确认周围的链接和格式保持不变。