Fix typo

Author: cjrh

src/query.rs

@@ -127,7 +127,7 @@ impl Query {
     /// * `schema` - Schema of the target index.
     /// * `field_name` - Field name to be searched.
     /// * `text` - String representation of the query term.
-    /// * `distance` - (Optional) Edit distance you are going to alow. When not specified, the default is 1.
+    /// * `distance` - (Optional) Edit distance you are going to allow. When not specified, the default is 1.
     /// * `transposition_cost_one` - (Optional) If true, a transposition (swapping) cost will be 1; otherwise it will be 2. When not specified, the default is true.
     /// * `prefix` - (Optional) If true, prefix levenshtein distance is applied. When not specified, the default is false.
     #[staticmethod]