In the same directory, there is a “gramps plugin registration” file (ending in .gpr.py) that has information about ALL the gramplets in that folder.
The pedigree gramplet is registered to be available in the splitbars of 4 view categories: People, Relationships, Charts, Geography.
Did not notice that the first set were for 5.1 so the updated links are for 5.2
By the way, if the wiki search returns outdated or foreign language results (as it often does) then you can navigate to the current version variant pretty easily:
The Gramps Glossary also works as a hotlinked index for the wiki. We have endeavored to link each glossary term to introductory text in the wiki about the feature and where to find it in the GUI. The Glossary is worth Bookmarking in your browser.