/usr/share/puppet/modules.available/puppetlabs-apache/templates/vhost/_docroot.erb is in puppet-module-puppetlabs-apache 3.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | ## Vhost docroot
<% if @virtual_docroot -%>
VirtualDocumentRoot "<%= @virtual_docroot %>"
<% elsif @docroot -%>
DocumentRoot "<%= @docroot %>"
<% end -%>
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