Correct typo: "Intance Translation" -> "Instance Translation".

Author: shaunplee

CHANGELOG.md

@@ -3,6 +3,9 @@ Change Log -- Ray Tracing in One Weekend
 
 # v3.1.2 (in progress)
 
+### _In One Weekend_
+  - Fix: Correct typo: "Intance Translation" -> "Instance Translation"
+
 ### _The Rest of Your Life_
   - Fix: Missing closing parenthesis in listing 10 (#603)
   - Fix: Tiny improvements to the lambertian::scatter() development (#604)

books/RayTracingTheNextWeek.html

@@ -2358,8 +2358,8 @@
 </div>
 
 
-Intance Translation
---------------------
+Instance Translation
+---------------------
 <div class='together'>
 Whether you think of this as a move or a change of coordinates is up to you. The code for this, to
 move any underlying hittable is a _translate_ instance.