[hotfix][docs] Remove duplicate line

This closes #6179.


Project: http://git-wip-us.apache.org/repos/asf/flink/repo
Commit: http://git-wip-us.apache.org/repos/asf/flink/commit/fd72b4e7
Tree: http://git-wip-us.apache.org/repos/asf/flink/tree/fd72b4e7
Diff: http://git-wip-us.apache.org/repos/asf/flink/diff/fd72b4e7

Branch: refs/heads/master
Commit: fd72b4e7835b5d97a2d8b61a3bf12a0369488633
Parents: afcb513
Author: Tobii42 <[email protected]>
Authored: Mon Jun 18 16:55:59 2018 +0200
Committer: zentol <[email protected]>
Committed: Wed Jun 27 22:01:16 2018 +0200

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 docs/dev/stream/operators/windows.md | 1 -
 1 file changed, 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/flink/blob/fd72b4e7/docs/dev/stream/operators/windows.md
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diff --git a/docs/dev/stream/operators/windows.md 
b/docs/dev/stream/operators/windows.md
index ad2b516..f657c80 100644
--- a/docs/dev/stream/operators/windows.md
+++ b/docs/dev/stream/operators/windows.md
@@ -1412,7 +1412,6 @@ val globalResults = resultsPerKey
 In this example, the results for time window `[0, 5)` from the first operation 
will also end up in
 time window `[0, 5)` in the subsequent windowed operation. This allows 
calculating a sum per key
 and then calculating the top-k elements within the same window in the second 
operation.
-and then calculating the top-k elements within the same window in the second 
operation.
 
 ## Useful state size considerations
 

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