fix: 更新「选择编译器」一节以同步官方最新文档

[hijiangtao]

Issue https://github.com/angular/angular-cli/issues/17736#issuecomment-629995982

[googlebot]

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[hijiangtao]

@googlebot I signed it!

[googlebot]

CLAs look good, thanks!

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[hijiangtao]

CI 失败，貌似是因为我没有权限？

... remote: Invalid username or password.

[asnowwolf]

不是，是我的 Travis 配置问题，在 PR 中应该关掉发布那个步骤，这部分脚本我没改。