lnrouter: LiquidityHints: add comment to update_liquidity_hints

diff --git a/electrum/lnrouter.py b/electrum/lnrouter.py
index 2768289..023395a 100644
--- a/electrum/lnrouter.py
+++ b/electrum/lnrouter.py
@@ -428,12 +428,16 @@ class LNPathFinder(Logger):
             self,
             route: LNPaymentRoute,
             amount_msat: int,
-            failing_channel: ShortChannelID=None
+            failing_channel: ShortChannelID = None,
     ):
-        # go through the route and record successes until the failing channel is reached,
-        # for the failing channel, add a cannot_send liquidity hint
-        # note: actual routable amounts are slightly different than reported here
-        # as fees would need to be added
+        """We mark all channels along the route as able to forward the amount, until
+        the failing channel is reached. For the failing channel, add a cannot_send liquidity hint.
+        In the case of success (failing_channel=None), we still mark channels of the route
+        as being able to send the same amount in the future, as we assume to not know the capacity.
+
+        note: actual routable amounts are slightly different than reported here
+              as fees would need to be added.
+        """
         for r in route:
             if r.short_channel_id != failing_channel:
                 self.logger.info(f"report {r.short_channel_id} to be able to forward {amount_msat} msat")
@@ -445,7 +449,7 @@ class LNPathFinder(Logger):
         else:
             assert failing_channel is None
 
-    def update_inflight_htlcs(self, route: LNPaymentRoute, *, add_htlcs: bool) -> None:
+    def update_num_inflight_htlcs(self, route: LNPaymentRoute, *, add_htlcs: bool) -> None:
         self.logger.info(f"{'Adding' if add_htlcs else 'Removing'} inflight htlcs to graph (liquidity hints).")
         for r in route:
             if add_htlcs:
diff --git a/electrum/lnworker.py b/electrum/lnworker.py
index 96995a9..5639cb4 100644
--- a/electrum/lnworker.py
+++ b/electrum/lnworker.py
@@ -2161,7 +2161,7 @@ class LNWallet(Logger):
             self.active_forwardings[fw_payment_key].append(htlc_key)
         if self.network.path_finder:
             # add inflight htlcs to liquidity hints; removed again in htlc_fulfilled/htlc_failed
-            self.network.path_finder.update_inflight_htlcs(shi.route, add_htlcs=True)
+            self.network.path_finder.update_num_inflight_htlcs(shi.route, add_htlcs=True)
         util.trigger_callback('htlc_added', chan, htlc, SENT)
 
     def handle_error_code_from_failed_htlc(
@@ -3160,7 +3160,7 @@ class LNWallet(Logger):
             chan.pop_onion_key(htlc_id)
             if self.network.path_finder:
                 self.network.path_finder.update_liquidity_hints(shi.route, shi.amount_receiver_msat)
-                self.network.path_finder.update_inflight_htlcs(shi.route, add_htlcs=False)
+                self.network.path_finder.update_num_inflight_htlcs(shi.route, add_htlcs=False)
             payment_key = payment_hash + shi.payment_secret_orig
             paysession = self._paysessions[payment_key]
             q = paysession.sent_htlcs_q
@@ -3208,7 +3208,7 @@ class LNWallet(Logger):
         if shi and htlc_id in chan.onion_keys:
             onion_key = chan.pop_onion_key(htlc_id)
             if self.network.path_finder:
-                self.network.path_finder.update_inflight_htlcs(shi.route, add_htlcs=False)
+                self.network.path_finder.update_num_inflight_htlcs(shi.route, add_htlcs=False)
             payment_okey = payment_hash + shi.payment_secret_orig
             paysession = self._paysessions[payment_okey]
             q = paysession.sent_htlcs_q