Fix typo in documentation

Author: Marcos Passos

README.md

@@ -154,7 +154,7 @@ $donors = new BloodDonors($equivalence);
 $james = new Person('James', 'A');
 $john = new Person('John', 'A');
 
-// James and John are considered equivalent once they the same blood group
+// James and John are considered equivalent once they are of the same blood group
 var_dump($equivalence->equivalent($james, $john)); // Outputs bool(true)
 
 // Initially, none of them are present in the collection
@@ -595,4 +595,4 @@ All contents of this package are licensed under the [MIT license](LICENSE).
 [link-author]: http://github.com/marcospassos
 [link-contributors]: https://github.com/marcospassos/phpcommon-comparison/graphs/contributors
 [link-issue-tracker]: https://github.com/marcospassos/phpcommon-comparison/issues
-[link-repository]: https://github.com/marcospassos/phpcommon-comparison
+[link-repository]: https://github.com/marcospassos/phpcommon-comparison