improve list formatting in 2020/ferguson1 markdown files

2020/ferguson1/bugs.md

@@ -3,21 +3,13 @@ Current bugs and things that look like bugs but are not, as of 12 September 2020
 <a name="toc"></a>
 
 -   [Built-in test unit for some features!](#builtin-test-unit)
-
 -   [The snake doesn't seem to be moving](#stillsnake)
-
 -   [getch() also accepts input from some input hardware other than keyboards](#getch)
-
 -   [SIZE=0 is the same as SIZE=1 and other oddities](#size)
-
 -   ['I was a few places behind my tail and I ran into it!'](#bitetail)
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 -   [With negative growth the snake drops from the middle of the body](#middleofsnake)
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 -   [It looks like the bug is in the snake](#buginsnake)
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 -   [On the safety of the bug placement loop](#bugplacement)
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 -   [Vertical snake has more space between snake char than horizontal](#verticalsnake)