Update docs/reference/esql/processing-commands/where.asciidoc

Co-authored-by: Andrei Stefan <[email protected]>

Author: KyleOnK8s

docs/reference/esql/processing-commands/where.asciidoc

@@ -7,7 +7,7 @@ the input table for which the provided condition evaluates to `true`.
 
 [TIP]
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-Docs with `null` field values will be excluded from search results where you are excluding a specific value from that field. For example: `WHERE field != "value"` will be interpreted as `WHERE field != "value" and field is not null`.
+In case of value exclusions, fields with `null` values (a `null` means either there is an explicit `null` value in the document or there is no value at all) will be excluded from search results. For example: `WHERE field != "value"` will be interpreted as `WHERE field != "value" AND field IS NOT NULL`.
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 **Syntax**