[Docs] Specify that Named Collections are not supported in Cloud

docs/en/operations/named-collections.md

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 title: "Named collections"
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 Named collections provide a way to store collections of key-value pairs to be
 used to configure integrations with external sources. You can use named collections with
 dictionaries, tables, table functions, and object storage.

docs/en/sql-reference/statements/alter/named-collection.md

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 sidebar_label: NAMED COLLECTION
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 # ALTER NAMED COLLECTION
 
 This query intends to modify already existing named collections.

docs/en/sql-reference/statements/create/named-collection.md

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 sidebar_label: NAMED COLLECTION
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 # CREATE NAMED COLLECTION
 
 Creates a new named collection.