[readme] update dingoadm install content (#9)

Signed-off-by: Dongwei <[email protected]>

Author: jackblack369

README.md

@@ -1,7 +1,7 @@
 DingoAdm
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-DingoAdm is a tool for deploy and manage Curve cluster, it's easy to use and with rich features.
+DingoAdm is a tool for deploy and manage DingoFS cluster, it's easy to use and with rich features.
 
 Documentation
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