chore: fix typos

[xiaoxianBoy]

fix typos

1. Fix bin/vault-unseal/src/main.rs typo
2. Fix examples/README.md typo

[haraldh]

plz also correct the source:

bin/vault-unseal/src/main.rs:    info!("Inititalizing vault");

[haraldh]

Ah, please gpg sign your commits

[haraldh]

why 4 commits?

[xiaoxianBoy]

why 4 commits?

add gpg😹

[haraldh]

Please do the following to resign your original 2 commits:

$ git reset --hard HEAD~2
$ git rebase --gpg-sign HEAD~2

[xiaoxianBoy]

Please do the following to resign your original 2 commits:

请执行以下操作以辞去您原来的2次提交：

$ git reset --hard HEAD~2
$ git rebase --gpg-sign HEAD~2

ths