docs/operators: fix a typo (#9559)

s/are preserved the output/are preserved in the output

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>

docs/querying/operators.md

@@ -222,7 +222,7 @@ or
 both `(label1, label2)` and `(label1, label2,)` are valid syntax.
 
 `without` removes the listed labels from the result vector, while
-all other labels are preserved the output. `by` does the opposite and drops
+all other labels are preserved in the output. `by` does the opposite and drops
 labels that are not listed in the `by` clause, even if their label values are
 identical between all elements of the vector.