docs: fix grammar in `functions.rst`.

pybind / pybind11

Seamless operability between C++11 and Python

https://pybind11.readthedocs.io/

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Closed kenjitoyama closed 1 year ago

kenjitoyama commented 1 year ago

Small fix to grammar, removing an unnecessary "a" before "several".

Small fix to grammar in functions.rst.