remove bold code

Remove markdown where test is both bold and code.
This double formatting produces undesirable effects in HTML.

One should make something **bold** or something `code`.
but not both.  The stacking of these two options produces bad
effects when rendered.

2020/ferguson1/terminals.md

@@ -75,8 +75,8 @@ will take to win the game. The max bugs in the `bugs` line is approximately
 `max_snake_size / growth_size` i.e. how many bugs it'll take to win at the
 maximum (capped) snake size.
 
-If I pass in any of the variables **`GROW`**, **`MAXSIZE`**, **`SIZE`** and/or
-**`LINES`** or **`COLUMNS`** it bases its calculations on those variables. For
+If I pass in any of the variables **GROW**, **MAXSIZE**, **SIZE** and/or
+**LINES** or **COLUMNS** it bases its calculations on those variables. For
 example:
 
 ```sh