docs: Remove incorrect warning

Closes #25935

Author: martijnvg

docs/reference/mapping/types/percolator.asciidoc

@@ -57,9 +57,6 @@ associated with the index used for percolation. In order to make sure these fiel
 add or update a mapping via the <<indices-create-index,create index>> or <<indices-put-mapping,put mapping>> APIs.
 Fields referred in a percolator query may exist in any type of the index containing the `percolator` field type.
 
-Also an index can only contain up to one percolator field mapping. Multiple percolator fields will be rejected by the
-put index and put mapping APIs.
-
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 [float]