The documentation has several dependencies which can be installed using pip:
$ pip install -r Documentation/requirements.txt
Whenever making changes to Cilium documentation you should check that you did not introduce any new warnings or errors, and also check that your changes look as you intended. To do this you can build the docs:
$ make -C Documentation html
After this you can browse the updated docs as HTML starting at
Alternatively you can use a Docker container to build the pages:
$ make render-docs
This builds the docs in a container and builds and starts a web server with your document changes.
Now the documentation page should be browsable on http://localhost:9080.