Update docstrings for elementwise functions (#2406)

The PR updates docstrings for elementwise functions to have a blank line
prior `Default` value, also to add expected dtype of input arrays where
missing, to align the dtypes with implementation and to fix some typos
which were identified.
Also a description of `include_initial` keyword is aligned for
cumulative functions. bbe197a

Author: github-actions[bot]

.buildinfo

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