website: add docs for connect native services API

website/source/api/agent/service.html.md

@@ -117,6 +117,10 @@ The table below shows this endpoint's support for
   service doesn't need to be registered, but the caller must have an ACL token
   with permissions for this service.
 
+- `Connect` `(Connect: nil)` - Specifies the configuration for
+  [Connect](/docs/connect/index.html). See the [Connect structure](#connect-structure)
+  section for supported fields.
+
 - `Check` `(Check: nil)` - Specifies a check. Please see the
   [check documentation](/api/agent/check.html) for more information about the
   accepted fields. If you don't provide a name or id for the check then they
@@ -154,6 +158,15 @@ The table below shows this endpoint's support for
     `false`. See [anti-entropy syncs](/docs/internals/anti-entropy.html) for
     more info.
 
+#### Connect Structure
+
+For the `Connect` field, the parameters are:
+
+- `Native` `(bool: false)` - Specifies whether this service supports
+  the [Connect](/docs/connect/index.html) protocol [natively](/docs/connect/native.html).
+  If this is true, then Connect proxies, DNS queries, etc. will be able to
+  service discover this service.
+
 ### Sample Payload
 
 ```json

website/source/api/catalog.html.md

@@ -54,7 +54,7 @@ The table below shows this endpoint's support for
 - `Service` `(Service: nil)` - Specifies to register a service. If `ID` is not
   provided, it will be defaulted to the value of the `Service.Service` property.
   Only one service with a given `ID` may be present per node. The service
-  `Tags`, `Address`, `ServiceMeta` and `Port` fields are all optional.
+  `Tags`, `Address`, `ServiceMeta`, `Port`, `ConnectNative` fields are all optional.
 
 - `Check` `(Check: nil)` - Specifies to register a check. The register API
   manipulates the health check entry in the Catalog, but it does not setup the
@@ -485,6 +485,9 @@ $ curl \
 - `ServiceProxyDestination` is the name of the service that is being proxied,
   for "connect-proxy" type services.
 
+- `ServiceConnectNative` is true if this service supports Connect
+  [natively](/docs/connect/native.html).
+
 ## List Nodes for Connect-capable Service
 
 This endpoint returns the nodes providing a