News147: Add LND #5159 description

Author: dongcarl

_posts/en/newsletters/2021-05-05-newsletter.md

@@ -126,7 +126,10 @@ BOLTs][bolts repo].*
   Future releases will instead prompt the user to reindex for an equivalent
   outcome.
 
-- [LND #5159][] AMP support for SendPaymentV2 FIXME:dongcarl
+- [LND #5159][] builds on [previous work][news144 lnd ampsendpayment] to add
+  support for making spontaneous Atomic Multipath Payments (AMPs) by manually
+  specifying payment parameters to the `sendpayment` RPC. Invoking `sendpayment`
+  with an AMP invoice is expected to be implemented in follow-up PRs.
 
 - [Rust-Lightning #893][] only allows accepting a payment if it includes
   a payment secret.  Payment secrets are created by the receiver and
@@ -170,4 +173,5 @@ BOLTs][bolts repo].*
 [capn proto]: https://capnproto.org/
 [news53 lightning loop]: /en/newsletters/2019/07/03/#lightning-loop-supports-user-loop-ins
 [semantic versioning website]: https://semver.org/
-[fido2 website]: https://fidoalliance.org/fido2/fido2-web-authentication-webauthn/
+[fido2 website]: https://fidoalliance.org/fido2/fido2-web-authentication-webauthn/
+[news144 lnd ampsendpayment]: /en/newsletters/2021/04/14/#lnd-5108

_topics/en/multipath-payments.md

@@ -122,6 +122,9 @@ optech_mentions:
   - title: "Rust-Lightning #893 requires payment secrets to prevent multipath probing"
     url: /en/newsletters/2021/05/05/#rust-lightning-893
 
+  - title: "LND #5159 adds support for making spontaneous AMPs"
+    url: /en/newsletters/2021/05/05/#lnd-5159
+
 ## Optional.  Same format as "primary_sources" above
 # see_also:
 #   - title: