Typo in "Retrival" Should Be Corrected to "Retrieval"

[Naresh-kumar-Thodupunoori]

It appears there is a typo in the text of the OpenSearch GPT project. The term "retrival" is used, which should be corrected to "retrieval." This small correction will improve the professionalism and accuracy of the project documentation.

Please update the relevant text to reflect the correct spelling and ensure consistency throughout the project. If there are any additional instances of this typo in other parts of the project, those should be corrected as well.

[Naresh-kumar-Thodupunoori]

Please assign me this issue!!