[AV-115725] Add new AI Functions Error to the SQL Error Reference (#473)

* Add new error to the SQL error reference

* Small nit

* Include the example for future changes

Author: Rebecca-Martinez007

modules/n1ql/pages/n1ql-language-reference/n1ql-error-codes.adoc

@@ -9,7 +9,7 @@
 /* Use this SQL++ query to generate finderr.json */
 
 WITH errors AS (ARRAY_FLATTEN((SELECT RAW finderr(".*")), 1)),
-     footnotes AS ([1040])
+     footnotes AS ([1040, 3000])
 SELECT code,
        description,
        ARRAY CASE WHEN ISARRAY(v) THEN CONCAT2(" ", v)
@@ -65,6 +65,13 @@ These errors are related to the parsing.
 include::partial$errors/errors-table.hbs[]
 --
 
+[NOTE#note-3000]
+.Error 3000
+====
+If you're using AI Functions, this error code indicates that the function you're using is not enabled or associated with an LLM.
+You need to xref:ai:build:ai-functions.adoc#enable-ai-functions[enable the function] and try again.
+====
+
 == 4xxx Codes (plan)
 
 These errors are related to the query plan.