fix issue: Camera exercise 2 comment nitpick JoeyDeVries#382, corrected minor typo in comment.

Author: SuperAoao

src/1.getting_started/7.6.camera_exercise2/camera_exercise2.cpp

@@ -12,7 +12,7 @@ glm::mat4 calculate_lookAt_matrix(glm::vec3 position, glm::vec3 target, glm::vec
     // Create translation and rotation matrix
     // In glm we access elements as mat[col][row] due to column-major layout
     glm::mat4 translation = glm::mat4(1.0f); // Identity matrix by default
-    translation[3][0] = -position.x; // Third column, first row
+    translation[3][0] = -position.x; // Fourth column, first row
     translation[3][1] = -position.y;
     translation[3][2] = -position.z;
     glm::mat4 rotation = glm::mat4(1.0f);