Fix typos in rms_norm.py and utils.py comments

[lxcxjxhx]

Changes

Fixed 7 typos in comments and docstrings:

src/liger_kernel/ops/rms_norm.py

• whileas → whereas (2 occurrences in docstrings)
• �acward → �ackward (2 occurrences in comments)

efore → �efore (1 occurrence in docstring)

esesidual →
esidual (1 occurrence in docstring)

src/liger_kernel/utils.py

• decices → devices (1 occurrence in comment)

Testing

Note: Full test suite could not be run locally due to environment constraints (requires Linux with NVIDIA GPU for Triton). Changes are documentation-only (comments and docstrings).

• No functional code changes
• No breaking changes
• Rely on CI/CD automated testing for verification

Impact

• Improves documentation clarity and professionalism
• No impact on functionality or performance