Changing comments to doc-comments [skip ci]

tests/util/mod.rs

@@ -5,14 +5,14 @@ use std::path::{PathBuf, Path};
 
 use rocksdb::{DB, Options};
 
-// Ensures that DB::Destroy is called for this database when DBPath is dropped.
+/// Ensures that DB::Destroy is called for this database when DBPath is dropped.
 pub struct DBPath {
     path: PathBuf
 }
 
 impl DBPath {
-    // Suffixes the given `prefix` with a timestamp to ensure that subsequent test runs don't reuse
+    /// Suffixes the given `prefix` with a timestamp to ensure that subsequent test runs don't reuse
-    // an old database in case of panics prior to Drop being called.
+    /// an old database in case of panics prior to Drop being called.
     pub fn new(prefix: &str) -> DBPath {
         let current_time = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
         let path = format!(