Regenerate documentation

.github/docs/openapi3.txt

@@ -1519,6 +1519,8 @@ type Schema struct {
 	MaxProps             *uint64              `json:"maxProperties,omitempty" yaml:"maxProperties,omitempty"`
 	AdditionalProperties AdditionalProperties `json:"additionalProperties,omitempty" yaml:"additionalProperties,omitempty"`
 	Discriminator        *Discriminator       `json:"discriminator,omitempty" yaml:"discriminator,omitempty"`
+
+	// Has unexported fields.
 }
     Schema is specified by OpenAPI/Swagger 3.0 standard. See
     https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#schema-object
@@ -1580,6 +1582,13 @@ func (schema Schema) MarshalYAML() (any, error)
 
 func (schema *Schema) NewRef() *SchemaRef
 
+func (schema Schema) OrderedPropertyKeys() []string
+    OrderedPropertyKeys returns the keys of the properties in the order they
+    were defined. This is useful for generating code that needs to iterate over
+    the properties in a consistent order. If the keys could not be extracted
+    for some reason, then this method automatically sorts the keys to be
+    deterministic.
+
 func (schema *Schema) PermitsNull() bool
 
 func (schema *Schema) UnmarshalJSON(data []byte) error