revert flag changes

Author: tac0turtle

docs/learn/config.md

@@ -90,8 +90,8 @@ db_path: "data"
 ```
 
 **Command-line Flag:**
-`--evolve.db_path <path>`
-*Example:* `--evolve.db_path "node_db"`
+`--rollkit.db_path <path>`
+*Example:* `--rollkit.db_path "node_db"`
 *Default:* `"data"`
 *Constant:* `FlagDBPath`