This issue has caused me no little consternation as well. In the Guidelines, in 9.3.2, for "Sec A," there is a space between the "Sec" and the "A." However, it is not easily (read: visually) apparent. One can only discern this by putting the cursor in the actual PDF and pressing the right arrow button over to reveal it. In the translation below it, the space is removed in the braille. I have been basing my spacing rules for functions and capital letters/Greek letters upon this sole example. If this is inaccurate, please let me know.