Clean up applicator assertion language

Co-authored-by: Ethan <[email protected]>

Author: gregsdennis

specs/jsonschema-core.md

@@ -601,9 +601,11 @@ the keyword's value. Alternatively, an applicator may refer to a schema
 elsewhere in the same schema document, or in a different one. The mechanism for
 identifying such referenced schemas is defined by the keyword.
 
-Applicator keywords also behave as assertions by defining how subschema or
-referenced schema boolean [assertion](#assertions) results are modified and/or
-combined to produce the boolean result of the applicator. Applicators may apply
+Applicator keywords also behave as assertions, using the assertion results of
+each subschema or referenced schema of the keyword. These boolean results are
+modified (e.g. the `not` keyword negates its subschema's assertion) and/or
+combined (e.g. `allOf` takes the conjunction of its subschemas' assertions)
+to produce the boolean result of the applicator.
 any boolean logic operation to the assertion results of subschemas, but SHOULD
 NOT introduce new assertion conditions of their own.[^2]