add two pictures and update two markdown

tutorials/source_en/use/data_preparation/data_processing_and_augmentation.md

@@ -229,6 +229,9 @@ The code output is as follows. Data values in each row of the dataset `ds2` is m
 ```
 ### zip
 MindSpore provides the `zip` function to combine multiple datasets into one dataset.
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+![avatar](../images/zip.png)
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 > If the column names in the two datasets are the same, the two datasets are not combined. Therefore, pay attention to column names.  
 > If the number of rows in the two datasets is different, the number of rows after combination is the same as the smaller number.
 ```python

tutorials/source_zh_cn/use/data_preparation/data_processing_and_augmentation.md

@@ -228,6 +228,9 @@ for data in ds2.create_dict_iterator():
 ```
 ### zip
 MindSpore提供`zip`函数，可将多个数据集合并成1个数据集。
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+![avatar](../images/zip.png)
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 > 如果两个数据集的列名相同，则不会合并，请注意列的命名。  
 > 如果两个数据集的行数不同，合并后的行数将和较小行数保持一致。
 ```python