[DOCS] Fix Sphinx Warnings (RST indent, cross-ref, and image scale) #4920
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Continue working for #4908. This PR fixed all indent/format warnings in RST doc files, doc cross-refernece, and image scale. After this PR we have 18 warnings remaining. While the target related warnings wil be covered by @cchung100m , here are 2 weird warnings that I have no idea:
@tqchen @cchung100m do you have any idea about them? Thanks.