Typo in multiple files

Following are the typo listed
* spelling of "grammatically" in the user prompt template in `examples/classification.py`.
* spelling of "respectively" in a comment describing label token mapping in `examples/classification.py`.
* "aribtrary" to "arbitrary" in comments describing batch shape handling in `gemma/gm/nn/_transformer.py` and `gemma/gm/nn/gemma3n/_transformer.py`.
* spelling of "triggering" in docstrings for output buffer length in `gemma/gm/text/_chat_sampler.py` and `gemma/gm/text/_sampler.py`.
* "argiments" to "arguments" in a comment about Jax vmap support in `gemma/gm/vision/_token_utils.py`.

I have raised a pr for fixing this