Fix Incorrect Implementation of mapPartitions in Example Code

[bscriver123]

Pull Request Description

Title: Fix Incorrect Usage of mapPartitions in Documentation/Examples

Related Issue: # Issue Title: mapPartitions code is incorrect

Background:
This pull request addresses an identified discrepancy in our documentation where the example provided for the mapPartitions function incorrectly utilizes forEachPartition instead. This could lead to confusion among users who are trying to understand the proper usage of mapPartitions.

Changes Made:

1. Documentation Updates:

   • Revised the existing documentation/examples to correctly demonstrate the usage of mapPartitions.
   • Updated all relevant sections to ensure that the examples match the expected behavior and functionality of mapPartitions.
   • Included explanations and comments within the code to clarify how mapPartitions operates compared to forEachPartition.

2. Code Examples:

   • Provided clear and concise examples showcasing how mapPartitions functions, including input and expected output.
   • Ensured consistency in coding style and adherence to project standards.

Testing:

• Reviewed the modified examples to ensure they work as intended.
• Where applicable, unit tests have been added or modified to verify the functionality of mapPartitions as demonstrated in the documentation.

Suggestions for Future Improvements:

• Consider including a comparison section in the documentation that highlights the key differences between mapPartitions and forEachPartition to further enhance user understanding.
• Implement a review process for documentation changes to catch such discrepancies earlier.

Conclusion:
This pull request rectifies the confusion surrounding the example usage of mapPartitions and should significantly improve user comprehension of this function. Your feedback would be greatly appreciated to finalize these changes. Thank you for your attention to this matter!