fix doubled 'the the' typos across multiple files
Six instances of 'the the' (doubled word) found across flax/cursor.py, flax/nnx/rnglib.py, flax/linen/linear.py, flax/nnx/transforms/compilation.py, and flax/nnx/nn/linear.py. Fixed to single 'the'. Docstring/comment-only changes.
Signed-off-by: SAY-5 <SAY-5@users.noreply.github.com>
