i18n(ja): miscellaneous review fixes (bit-shift description)

[yahonda]

Miscellaneous Japanese fluency fixes found during review, kept separate from the release-notes PR (#23254).

• functions-and-operators/bit-functions-and-operators.md: fix the left-shift example — n`位置左に → 左にn桁 (EN: "shift ... to the left by n positions"), and add the missing を after 1<<n.

Further small review findings may be added to this PR.

• Might cause conflicts after applied to another branch

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[gemini-code-assist]

Code Review

This pull request updates the Japanese documentation for bitwise functions to clarify the description of the left-shift operator. The reviewer suggested a minor improvement to use 'ビット' (bits) instead of '桁' (digits) for better technical accuracy and consistency with the rest of the document.

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[gemini-code-assist]

For bit-shift operations, it is technically more accurate to use 'ビット' (bits) instead of '桁' (digits/positions). This also ensures consistency with other terms used in the document (such as 'ビットをゼロで埋めます').

We recommend updating it as follows:

たとえば、次のステートメントでは、 `1<<n`を使用して、バイナリ値`1`を左に`n`ビットシフトします。

References

1. Technical accuracy and terminology consistency: Using 'ビット' (bits) instead of '桁' (digits) is technically more accurate for bitwise operations and consistent with the rest of the document. ^(link)