Fix typo in Chapter 6

marijnh · marijnh · commit 8aab52ce91f4 · 2018-02-25T09:51:23.000+01:00
diff --git a/06_object.md b/06_object.md
@@ -863,9 +863,9 @@ temperature using degrees Fahrenheit.
 {{index inheritance, "matrix example", "object-oriented programming", "SymmetricMatrix class"}}
 
 Some matrices are known to be _symmetric_. If you mirror a symmetric
-matrix around it top-left to bottom-right diagonal, it stays the same.
-In other words, the value stored at _x_,_y_ is always the same as that
-at _y_,_x_.
+matrix around its top-left to bottom-right diagonal, it stays the
+same. In other words, the value stored at _x_,_y_ is always the same
+as that at _y_,_x_.
 
 Imagine we need a data structure like `Matrix`, but one which enforces
 the fact that the matrix is and remains symmetrical. We could write it
