update examples

[yinxulai]

No description provided.

[qiniu-x]

[Git-flow] Hi @yinxulai, There are some suggestions for your information:

---

Rebase suggestions

• Following commits seems generated via git merge

  Merge branch '4.x' into 4.x

  Merge remote-tracking branch 'upstream/4.x' into 4.x

• Following commits have duplicated messages

  fix typo

  fix typo

Which seems insignificant, recommend to use git rebase command to reorganize your PR.

For other git-flow instructions, recommend refer to these examples.

If you have any questions about this comment, feel free to raise an issue here:

• https://github.com/qiniu/reviewbot