WIP

workshop/steps/02-vectors-length/README.md

@@ -9,7 +9,7 @@ An arrow `(x, y)` has a length: how far it reaches. Pythagoras:
 
 ### Normalize
 
-Often you want *just the direction* of an arrow, with length exactly 1 (a "unit
+Often you want _just the direction_ of an arrow, with length exactly 1 (a "unit
 vector"). You get it by dividing the arrow by its own length:
 `(x / len, y / len)`.
 
@@ -20,14 +20,15 @@ straight movement.
 > ⚠️ **The zero-vector trap.** What is the length of `(0, 0)`? Zero. What is
 > `0 / 0`? `NaN`. If you normalize a zero vector naively, you poison it with
 > `NaN`, and `NaN` spreads through every later calculation silently. A correct
-> `normalize` must check for zero length and return `(0, 0)` instead of dividing.
-> Remember this trap — it is exactly the kind of bug that hides in a real engine.
+> `normalize` must check for zero length and return `(0, 0)` instead of
+> dividing. Remember this trap — it is exactly the kind of bug that hides in a
+> real engine.
 
 ### Dot product
 
 `dot(a, b) = a.x*b.x + a.y*b.y`. One number out of two vectors. For now just
-implement it; in step 09 you'll learn that it answers "how much of arrow A points
-along arrow B?" — the key to sliding along a wall.
+implement it; in step 09 you'll learn that it answers "how much of arrow A
+points along arrow B?" — the key to sliding along a wall.
 
 ## Task