typo fix (and -> any) (#21860)

docs/reference/aggregations/metrics/scripted-metric-aggregation.asciidoc

@@ -110,7 +110,7 @@ For more details on specifying scripts see <<modules-scripting, script documenta
 
 ==== Allowed return types
 
-Whilst and valid script object can be used within a single script. the scripts must return or store in the `_agg` object only the following types:
+Whilst any valid script object can be used within a single script, the scripts must return or store in the `_agg` object only the following types:
 
 * primitive types
 * String