DOC : Fixes the issue #2611 by explicitly mentioning the default values

[AdityaChaubeyIITM]

[Description of PR]

Helps the users to easily find the default write_empty_chunks value, and the write_empty_chunks value used in the config of an array / group by looking at the docs.
Provides the default values of other configs as well.

[AdityaChaubeyIITM]

Hello @d-v-b I have committed the required changes as mentioned above, is there anything else that I missed? Please let me know

[AdityaChaubeyIITM]

Hello @d-v-b Please let me know if it helps with the issue #2611 or if some ither changes need to be done to make it more visually appealing/ inline with standard doc writing style.