Update Migrating your existing Production DB.md

Fixed broken link to replication doc

Author: jzhang-skysql

docs/Data loading, Migration/Migrating your existing Production DB.md

@@ -32,7 +32,7 @@ Our [SkyDBA team](https://skysqlinc.github.io/skysql-docs/FractionalDBA/) can he
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 # Replicating data from an External DB
-Click [here](Replicating%20data%20from%20external%20DB%20cdf15e1cd8d24880858d6cd2f50d8fd2.md) for a detailed walk through of the steps involved.
+Click [here](https://skysqlinc.github.io/skysql-docs/Data%20loading%2C%20Migration/Replicating%20data%20from%20external%20DB/) for a detailed walk through of the steps involved.
 
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