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asciidoc-fedora: Update partials docs for Antora 2.0 This commit refactors the documentation on how to use reusable attributes. Recently I needed to create reusable attributes in a docs project with multiple modules (a.k.a. this repo). So, while digging, I discovered that the way I learned to include partials is deprecated since Antora 1.1. The current stable version is 2.3.4 and an early alpha is released for v3.0.0. So, this is a slight modernization to make sure we are giving people the right advice to set up their partials in a way that will continue to work in future versions of Antora. Hurrah! References: * https://docs.antora.org/antora/2.3/partials-directory/ * https://docs.antora.org/antora/2.3/page/partials-and-content-snippets/ * https://docs.antora.org/antora/2.3/page/include-a-partial/ * https://docs.antora.org/antora/2.2/asciidoc/page-to-page-xref/ Signed-off-by: Justin W. Flory (he/him) <git@jwf.io>