some paragraphs don't have a linkable # marker

[rcmiller]

This paragraph has no linkable # marker in the left margin:
http://web.mit.edu/6.031/www/sp20/classes/22-locks/#^deadlock

but this paragraph (which also starts with a topics-and-terms word) does have a linkable # marker:
file:///Users/rcm/6.031-fa20/classes/22-locks/handout/index.html#^blocking