As of 5.4.0 the puppetlabs-apache mod's README page has a number of dead links. Several of the links to other parts of the docs reference old material that no longer exists.
For example, in the "Installing arbitrary modules" section, the final sentence:
"There are several optional parameters you can specify when defining Apache modules this way. See the defined type's reference for details."
That link does not exist, and thus no examples can be found. This is important for users who need to know how to add custom and arbitrary modules.
There are a few others as well, clicking them just takes you to the top of the page.