Add "Docs - Missing input and output images for Doxygen (#331)" to 6.1.0 docs

[peterjunpark]

Fixes broken links / images (#331) in 6.1.0 docs.

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• added missing outputs for image augmentations

modified the description with correct output names

• added gif for voxel input and outputs

• modified the output images for water, resize_crop_mirror and resize_mirror_normalize

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[kiritigowda]

@peterjunpark is this PR ready to be merged?