Fixed markdown.

Author: michal-czardybon

src/doc/trpl/ownership.md

@@ -121,7 +121,7 @@ let v = vec![1, 2, 3];
 let v2 = v;
 ```
 
-The first line allocates memory for the vector object, 'v', and for the data it
+The first line allocates memory for the vector object, `v`, and for the data it
 contains. The vector object is stored on the [stack][sh] and contains a pointer
 to the content ([1, 2, 3]) stored on the [heap][sh]. When we move `v` to `v2`,
 it creates a copy of that pointer, for `v2`. Which means that there would be two