Conceal 'private' methods from documentation

[salvadord]

Now "package reference" section lists all the methods/functions across the codebase. But many of them are intended to be private. I suppose sphinx (lib that autogenerates the docs) should have such option to exclude a given method, otherwise, we can try prefixing the private ones with double-underscore.
The ultimate goal is to make only those methods to be discoverable through docs, which are intended to be exposed to the users