docs(tvix/store): address cargo doc warnings

Fix some broken link references.

Change-Id: I69c9b2b62af35bb777e4df1a01ba3181a368be47
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9214
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

tvix/store/src/blobservice/from_addr.rs

@@ -10,7 +10,7 @@ use super::{BlobService, GRPCBlobService, MemoryBlobService, SledBlobService};
 /// - `sled://` ([SledBlobService])
 /// - `grpc+*://` ([GRPCBlobService])
 ///
-/// See their [from_url] methods for more details about their syntax.
+/// See their `from_url` methods for more details about their syntax.
 pub fn from_addr(uri: &str) -> Result<Arc<dyn BlobService>, crate::Error> {
     let url = Url::parse(uri)
         .map_err(|e| crate::Error::StorageError(format!("unable to parse url: {}", e)))?;

tvix/store/src/blobservice/mod.rs

@@ -51,5 +51,5 @@ pub trait BlobWriter: io::Write + Send + Sync + 'static {
 /// A [io::Read] that also allows seeking.
 pub trait BlobReader: io::Read + io::Seek + Send + 'static {}
 
-/// A Cursor<Vec<u8>> can be used as a BlobReader.
+/// A [`io::Cursor<Vec<u8>>`] can be used as a BlobReader.
 impl BlobReader for io::Cursor<Vec<u8>> {}