Fix link to contributor's guide

Signed-off-by: Garima Negi <garima.negy@gmail.com>

CONTRIBUTING.md

@@ -4,7 +4,7 @@ We welcome contributions to the FireFly Project in many forms, and
 there's always plenty to do!
 
 Please visit the
-[contributors guide](https://hyperledger.github.io/firefly/contributors/contributors.html) in the
+[contributors guide](https://hyperledger.github.io/firefly/contributors/) in the
 docs to learn how to make contributions to this exciting project.
 
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