Fixing typo

Author: iabotsiTC

src/crates/link.md

@@ -20,7 +20,7 @@ fn main() {
 ```
 
 ```bash
-# Where library.rlib is the path to to the compiled library, assumed that it's
+# Where library.rlib is the path to the compiled library, assumed that it's
 # in the same directory here:
 $ rustc executable.rs --extern rary=library.rlib && ./executable
 called rary's `public_function()`