[DOCS] Update example for GET /_cat/aliases (#67263) (#67296)

Co-authored-by: Douglas Robert Wallin <32135045+wallind@users.noreply.github.com>

docs/reference/cat/alias.asciidoc

@@ -73,7 +73,7 @@ PUT test1
 
 [source,console]
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-GET /_cat/aliases?v
+GET /_cat/aliases?v=true
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 // TEST[continued]