They are not too useful as examples, since they need to save `.pgf`files, which are not scraped nor exposed in any way from the generateddocs.

`annotate_explain.py` and `connectionstyle_demo.py` can be inlined wherethey are used in the Annotations tutorial.`custom_boxstyle01.py` is half written in the "Defining custom boxstyles" section, so just insert the second half.`annotate_text_arrow.py` is better explained in the "Annotating withboxed text" section of the Annotations tutorial.`simple_annotate01.py` repeats all of the tutorial, but without anyexplanatory text.