Clean up some doc links in lightning_block_sync.

Relative HTML doc paths in doc links works locally, but breaks on
crates.io. Luckily, we can now use explicit full paths and rustdoc
will resolve them for us.

Author: TheBlueMatt

lightning-block-sync/src/init.rs

@@ -9,7 +9,7 @@ use lightning::chain;
 
 /// Returns a validated block header of the source's best chain tip.
 ///
-/// Upon success, the returned header can be used to initialize [`SpvClient`]. Useful during a fresh
+/// Upon success, the returned header can be used to initialize [`crate::SpvClient`]. Useful during a fresh
 /// start when there are no chain listeners to sync yet.
 pub async fn validate_best_block_header<B: BlockSource>(block_source: &mut B) ->
 BlockSourceResult<ValidatedBlockHeader> {
@@ -22,12 +22,12 @@ BlockSourceResult<ValidatedBlockHeader> {
 /// Performs a one-time sync of chain listeners using a single *trusted* block source, bringing each
 /// listener's view of the chain from its paired block hash to `block_source`'s best chain tip.
 ///
-/// Upon success, the returned header can be used to initialize [`SpvClient`]. In the case of
+/// Upon success, the returned header can be used to initialize [`crate::SpvClient`]. In the case of
 /// failure, each listener may be left at a different block hash than the one it was originally
 /// paired with.
 ///
 /// Useful during startup to bring the [`ChannelManager`] and each [`ChannelMonitor`] in sync before
-/// switching to [`SpvClient`]. For example:
+/// switching to [`crate::SpvClient`]. For example:
 ///
 /// ```
 /// use bitcoin::hash_types::BlockHash;
@@ -113,9 +113,8 @@ BlockSourceResult<ValidatedBlockHeader> {
 /// }
 /// ```
 ///
-/// [`SpvClient`]: ../struct.SpvClient.html
-/// [`ChannelManager`]: ../../lightning/ln/channelmanager/struct.ChannelManager.html
-/// [`ChannelMonitor`]: ../../lightning/chain/channelmonitor/struct.ChannelMonitor.html
+/// [`ChannelManager`]: `lightning::ln::channelmanager::ChannelManager`
+/// [`ChannelMonitor`]: `lightning::chain::channelmonitor::ChannelMonitor`
 pub async fn synchronize_listeners<B: BlockSource, C: Cache>(
 	block_source: &mut B,
 	network: Network,