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The 0.05 is for the little pins that we've been debating the position and form of. One might argue that I'm getting ahead of things by ordering it this early. Good stuff to have anyway though.
The two rows of 9 pins are 0.1". I think the Pico comes with the 2 9 pin long 0.1" pieces of pin header for the sides. 0.1" pin header is something you'll inevitably need though, no harm in buying it. 0.1" is the "standard" size for pin header.
awww crap, I didn't read carefully enough...