Fixes Typos in multiple files

[hawkaii]

This pull request consists of minor corrections to spelling and grammar in comments and docstrings across several files. These changes improve code readability and maintain consistency in documentation.

Fixes #423
Documentation and comment corrections:

• Fixed spelling of "grammatically" in the user prompt template in examples/classification.py.
• Corrected spelling of "respectively" in a comment describing label token mapping in examples/classification.py.
• Corrected "aribtrary" to "arbitrary" in comments describing batch shape handling in gemma/gm/nn/_transformer.py and gemma/gm/nn/gemma3n/_transformer.py. [1] [2]
• Fixed spelling of "triggering" in docstrings for output buffer length in gemma/gm/text/_chat_sampler.py and gemma/gm/text/_sampler.py. [1] [2]
• Corrected "argiments" to "arguments" in a comment about Jax vmap support in gemma/gm/vision/_token_utils.py.

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