chore: improve code comments clarity

Signed-off-by: stringscut <stringscut@outlook.jp>

src/cmd/import.rs

@@ -37,7 +37,7 @@ fn import_autojump(db: &mut Database, buffer: &str) -> Result<()> {
         let mut rank = rank.parse::<f64>().with_context(|| format!("invalid rank: {rank}"))?;
         // Normalize the rank using a sigmoid function. Don't import actual ranks from
         // autojump, since its scoring algorithm is very different and might
-        // take a while to get normalized.
+        // take a while to normalize.
         rank = sigmoid(rank);
 
         db.add_unchecked(path, rank, 0);

src/db/mod.rs

@@ -76,7 +76,7 @@ impl Database {
     }
 
     /// Creates a new directory. This will create a duplicate entry if this
-    /// directory is always in the database, it is expected that the user either
+    /// directory is already in the database, it is expected that the user either
     /// does a check before calling this, or calls `dedup()` afterward.
     pub fn add_unchecked(&mut self, path: impl AsRef<str> + Into<String>, rank: Rank, now: Epoch) {
         self.with_dirs_mut(|dirs| {

src/db/stream.rs

@@ -70,7 +70,7 @@ impl<'a> Stream<'a> {
         }
 
         // The logic here is reversed - if we resolve symlinks when adding entries to
-        // the database, we should not return symlinks when querying back from
+        // the database, we should not return symlinks when querying from
         // the database.
         let resolver =
             if self.options.resolve_symlinks { fs::symlink_metadata } else { fs::metadata };

src/shell.rs

@@ -100,7 +100,7 @@ mod tests {
         let mut source = String::new();
 
         // Filter out lines using edit:*, since those functions are only available in
-        // the interactive editor.
+        // interactive editor mode.
         for line in Elvish(&opts).render().unwrap().lines().filter(|line| !line.contains("edit:")) {
             source.push_str(line);
             source.push('\n');