Remove phrase "child validation."

As @awwright noted, "child validation" is not a separate thing.

Author: handrews

jsonschema-validation.xml

@@ -180,7 +180,9 @@
                 <t>
                     Two of the primitive types, array and object, allow for child values.
                     The validation of the primitive type is considered separately from
-                    the validation of child instances.
+                    the validation of child instances.  Validation of the complete instance
+                    succeeds if validation of the primitive type and validation
+                    of each child instance succeeds.
                 </t>
                 <t>
                     Note that while array elements are validated by at most one
@@ -407,11 +409,11 @@
                         If absent, it can be considered present with an empty schema.
                     </t>
                     <t>
-                        If "items" is a schema, child validation succeeds if all elements
+                        If "items" is a schema, validation succeeds if all elements
                         in the array successfully validate against that schema.
                     </t>
                     <t>
-                        If "items" is an array of schemas, child validation succeeds if
+                        If "items" is an array of schemas, validation succeeds if
                         each element of the instance validates against the schema at the
                         same position, if any.
                     </t>
@@ -425,7 +427,7 @@
                         If absent, it can be considered present with an empty schema.
                     </t>
                     <t>
-                        If "items" is an array of schemas, child validation succeeds
+                        If "items" is an array of schemas, validation succeeds
                         if every instance element at a position greater than the size
                         of "items" validates against "additionalItems".
                     </t>
@@ -550,7 +552,7 @@
                         and do not match any regular expression in "patternProperties".
                     </t>
                     <t>
-                        For all such properties, child validation succeeds if the child instance
+                        For all such properties, validation succeeds if the child instance
                         validates against the "additionalProperties" schema.
                     </t>
                 </section>