[TEST] fixed typo in _cat/thread_pool docs

docs/reference/cat/thread_pool.asciidoc

@@ -11,7 +11,7 @@ host1 192.168.1.35 0 0 0 0 0 0 0 0 0
 host2 192.168.1.36 0 0 0 0 0 0 0 0 0
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-The first two columns tell your the host and ip of a node.
+The first two columns contain the host and ip of a node.
 
 [source,shell]
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