Fix clippy warnings after rust update (#1476)

Author: maciektr

scarb/src/internal/serdex.rs

@@ -32,10 +32,10 @@ impl TryFrom<&str> for MergeStrategy {
 /// If `source` and `target` are tables and a specific key exists in both, the conflict will be
 /// resolved as follows:
 /// 1) If value under the conflicting key in either `source` or `target` is not a table, the value
-/// in `target` will be overridden with the value from `source`. This means that no keys from
-/// subtables under the conflicting key will be preserved.
+///     in `target` will be overridden with the value from `source`. This means that no keys from
+///     subtables under the conflicting key will be preserved.
 /// 2) If values under the conflicting key in both `source` and `target` are tables,
-/// the conflict will be resolved with one of two strategies defined by `source`:
+///     the conflict will be resolved with one of two strategies defined by `source`:
 ///    a) If `source` have a key `merge-strategy` with value `override`, the value in `target` will
 ///     be overridden with the value from `source`.
 ///    b) If `source` have a key `merge-strategy` with value `merge`, the value in `target` will be