fix(ci): drop broken intra-doc link to SpawnFingerprint

CI's `RUSTDOCFLAGS='-D warnings' cargo doc --no-deps --document-private-items`
fails on the `[`SpawnFingerprint`]` link in `collect_tracked_envs`'s
docstring — it's not in scope at that site. Rewrite the prose to drop
the link; no information lost.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: wan9chi

crates/vite_task/src/session/execute/mod.rs

@@ -867,7 +867,7 @@ fn is_ignored(path: &RelativePathBuf, ignored: &FxHashSet<RelativePathBuf>) -> b
 /// Select tool-reported env records to embed in the post-run fingerprint.
 /// Only `tracked: true` records are included, and names that the user already
 /// declared as fingerprinted are skipped (their value is already in the cache
-/// key via [`SpawnFingerprint`]).
+/// key via the spawn fingerprint).
 fn collect_tracked_envs(reports: &Reports, metadata: &CacheMetadata) -> BTreeMap<Str, Option<Str>> {
     let fingerprinted = &metadata.spawn_fingerprint.env_fingerprints().fingerprinted_envs;
     reports