Add back semicolons to the HTTP server example in about page

[lpinca]

Reverts #641

Not sure what are the better practices there, I guess the purpose was to test the bot.
Anyway I'm filing this pr because semicolons have been removed and this makes the example inconsistent with all the others (guides, API docs, etc).

cc: @Fishrock123

[Fishrock123]

Feel free to re-add the semicolons but the rest is actually better practice, I.e. Not using writeHead() directly

[lpinca]

Forgive my ignorance but what's wrong with writeHead()? It's a public api afaik.

[Fishrock123]

Nothing is wrong with it, but chances are you are not going to be calling it directly from user code. :)

[lpinca]

I'm still not sure why I should prefer

res.statusCode=200;res.setHeader('Content-Type','text/plain');

over

res.writeHead(200,{'Content-Type': 'text/plain'});

but it doesn't matter. I've updated the pr to only re-add the semicolons.

[fhemberger]

Cool, thanks!