Link to function catalog docs for config props (#526)

Prior to this commit, each app documented its available config props
in its README.adoc. Now that the functions have been moved to the
function catalog, these inline docs are replaced w/ a link to the
respective function catalog docs.

See #524

applications/source/tcp-source/README.adoc

@@ -9,22 +9,8 @@ Messages produced by the TCP source application have a `byte[]` payload.
 
 == Options
 
-//tag::configuration-properties[]
-Properties grouped by prefix:
-
-
-=== tcp
-
-$$nio$$:: $$Whether to use NIO.$$ *($$Boolean$$, default: `$$false$$`)*
-$$port$$:: $$The port on which to listen; 0 for the OS to choose a port.$$ *($$Integer$$, default: `$$1234$$`)*
-$$reverse-lookup$$:: $$Perform a reverse DNS lookup on the remote IP Address; if false, just the IP address is included in the message headers.$$ *($$Boolean$$, default: `$$false$$`)*
-$$socket-timeout$$:: $$The timeout (ms) before closing the socket when no data is received.$$ *($$Integer$$, default: `$$120000$$`)*
-$$use-direct-buffers$$:: $$Whether to use direct buffers.$$ *($$Boolean$$, default: `$$false$$`)*
-
-=== tcp.supplier
-
-$$buffer-size$$:: $$The buffer size used when decoding messages; larger messages will be rejected.$$ *($$Integer$$, default: `$$2048$$`)*
-$$decoder$$:: $$The decoder to use when receiving messages.$$ *($$Encoding$$, default: `$$<none>$$`, possible values: `CRLF`,`LF`,`NULL`,`STXETX`,`RAW`,`L1`,`L2`,`L4`)*
+//tag::configuration-properties[link-to-catalog=true]
+https://github.com/spring-cloud/spring-functions-catalog/tree/main/supplier/spring-tcp-supplier#configuration-options[See Spring Functions Catalog for configuration options].
 //end::configuration-properties[]
 
 == Available Decoders