Fix template for inputs docstrings
# What does this PR do?

The templates for the PyTorch model has a mistake in the input dosctrings (parenthesis should be inside the docstring and not the format) and several models had the same mistake (I realized it while reviewing Splinter actually). This PR fixes all of those and cleans up a few problems I spotted at the same time:
- image models don't need a format because there is nothing to format in the input docstrings
- some models that had the correct template for the input docstrings also add the parenthesis in some of the formats.