fix mining redirect

Author: corwintines

public/_redirects

@@ -72,9 +72,9 @@
 
 /en/dart/ /en/developers/docs/programming-languages/dart/ 301!
 
-/developers/docs/consensus-mechanisms/pow/mining/ /en/developers/docs/consensus-mechanisms/pow/mining/ 301!
+/developers/docs/mining/ /en/developers/docs/consensus-mechanisms/pow/mining/ 301!
 
-/en/developers/docs/consensus-mechanisms/pow/mining/ /en/developers/docs/consensus-mechanisms/pow/mining/ 301!
+/en/developers/docs/mining/ /en/developers/docs/consensus-mechanisms/pow/mining/ 301!
 
 /*/beginners /:splat/what-is-ethereum/ 301!