fix anchor link

[rjbs]

The old link was to #Object Construction but the live page has an underscore in place of space.

[moritz]

Since the heading doesn't use an underscore either, IMHO it would be a good idea to fix the tooling instead of generate the correct URL from the link without the underscore

[zoffixznet]

I've came across this PR many times, but just now realized that we can't fix the tooling for this case for these reasons:

1. The hash of the URL comes from an id attribute, which is forbidden to have space characters in it
2. Even if those were allowed, they are not allowed to be non-encoded in URLs, which would make writing the URLs harder ( ->%20), and they'd also look uglier.