doc: dns.lookupService has wrong header level

[wizicer]

dns.lookupService has wrong header level which made the index display not so elegant. refer to https://iojs.org/api/dns.html

[rvagg]

thanks @wizicer, would you mind having a look at CONTRIBUTING.md to see the expected commit message style? you should prefix the message with a "doc:" in this case.

[wizicer]

sorry for the inconvenience, I read the document again, and took a look at the closed PR, then submit again.

Let me know if still something is missing.

[bnoordhuis]

@wizicer Sorry to trouble you again but can you sign the commit with your real name? Thanks!

[wizicer]

@bnoordhuis I change the auther name of the commit, please review again.

BTW, I'm curious about how you know I'm not using the right name the commit, I just knew we can get it from git client, but I can't find this type of information in github.

[bnoordhuis]

@wizicer Thanks, landed in df0d790.

BTW, I'm curious about how you know I'm not using the right name the commit, I just knew we can get it from git client, but I can't find this type of information in github.

One of GH's many small tricks: when you add .patch to the PR URL, you get the raw changeset, including the author's name: https://github.com/iojs/io.js/pull/552.patch