f - Rephrase WatchedOutput docs

Author: jkczyz

lightning/src/chain/mod.rs

@@ -144,8 +144,8 @@ pub trait Filter: Send + Sync {
 /// A transaction output watched by a [`ChannelMonitor`] for spends on-chain.
 ///
 /// Used to convey to a [`Filter`] an output identified by `outpoint` having `script_pubkey` as the
-/// spending condition. If `block_hash` is `Some`, this indicates the output was spent in the
-/// corresponding block.
+/// spending condition. If `block_hash` is `Some`, this indicates the output may have been spent in
+/// the corresponding block.
 ///
 /// [`ChannelMonitor`]: channelmonitor/struct.ChannelMonitor.html
 pub struct WatchedOutput {