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

Rephrasing for clarity

Co-authored-by: Liam Thompson <[email protected]>

Author: KyleOnK8s

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

@@ -7,7 +7,9 @@ the input table for which the provided condition evaluates to `true`.
 
 [TIP]
 ====
-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`.
+In case of value exclusions, fields with `null` values will be excluded from search results. 
+In this context a `null` means either there is an explicit `null` value in the document or there is no value at all.
+For example: `WHERE field != "value"` will be interpreted as `WHERE field != "value" AND field IS NOT NULL`.
 ====
 
 **Syntax**