updated documentation instructions to reflect new approach
To build and check the documentation:
1. `cd docs/`
-2. `sphinx-apidoc -f --separate --no-toc -o source/ ../pyrsa`
-3. `make html`
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+2. `make html`
+
+When adding, removing or renaming a module, create / adapt a stub for autodoc.
+Have a look at this RST cheatsheet: https://thomas-cokelaer.info/tutorials/sphinx/rest_syntax.html
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