minor antora docs fixes

Author: spencergibb

docs/modules/ROOT/pages/appendix.adoc

@@ -11,6 +11,8 @@ This appendix provides a list of common Spring Cloud Gateway properties and refe
 NOTE: Property contributions can come from additional jar files on your classpath, so you should not consider this an exhaustive list.
 Also, you can define your own properties.
 
+include::partial$_configprops.adoc[]
+
 [[observability]]
 == Observability metadata
 

docs/src/main/asciidoc/README.adoc

@@ -25,4 +25,4 @@ include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/main/
 [[contributing]]
 = Contributing
 
-include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/docs/src/main/asciidoc/contributing.adoc[]
+include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/main/docs/src/main/asciidoc/contributing.adoc[]