修复文件中的注释错误部分

src/ShardingCore/Extensions/IShardingQueryableExtension.cs

@@ -118,7 +118,7 @@ namespace ShardingCore.Extensions
         /// <summary>
         /// 切换数据源,保留原始数据源中的Expression
         /// </summary>
-        /// <param name="source">元数据源</param>
+        /// <param name="source">原数据源</param>
         /// <param name="dbContext">新数据源</param>
         /// <returns></returns>
         internal static IQueryable ReplaceDbContextQueryable(this IQueryable source, DbContext dbContext)

src/ShardingCore/Sharding/ShardingDbContextExecutors/DataSourceDbContext.cs

@@ -102,12 +102,6 @@ namespace ShardingCore.Sharding.ShardingDbContextExecutors
             }
             try
             {
-
-                if (_dbContextOptions != null)
-                {
-                    return _dbContextOptions;
-                }
-
                 var dbContextOptionsBuilder = CreateDbContextOptionBuilder();
 
                 if (IsDefault)