I tried adding a comment to a blog, with a hyperlink (i.e. using the Insert->Link selection from the editor toolbar) and the URL was (without the spaces of course):
https : // raw . githubusercontent.com/shabaz123/adc_board_basic/main/pico_adc_basic.pdf
However, when I do that, it generates an error.
My question is, do I get an award for finding two bugs in a weekend : )