docs: in-page jumping failed on CN and EN getting-started page

[yzeng25]

Improve Docs

Please describe which part of docs should be improved or typo fixed

in-page jumping failed on CN getting-started page

Describe the solution you'd like

fix the link so that it will jump to 'step 2'

[yzeng25]

Fixed in PRs linked above, the in-page jumping feature is back to normal in the next version.
Ref: http://apisix.apache.org/zh/docs/apisix/next/getting-started#%E7%AC%AC%E4%BA%8C%E6%AD%A5%EF%BC%9A%E5%88%9B%E5%BB%BA%E8%B7%AF%E7%94%B1 and http://apisix.apache.org/docs/apisix/next/getting-started#step-2-create-a-route