Docs: add responseMimeType to the helper method example usage

[Dimas-Saputra-Me]

Description of the bug:

Just asked about responseMimeType in the forum while ago forum. It just got updated in 0.6.0 what a perfect timing.

But I found some catch (not a big deal tho, but maybe it will help in the future) on the helper method example usage there is no responseMimeType written on it. But I can still use it perfectly normal.

Actual vs expected behavior:

Actual:

Expected: responseMimeType parameter example

Any other information you'd like to share?

No response