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

[yahonda]

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

29 changed lines across 22 files. Each is a 1-for-1 line replacement.

• 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.
• sql-tuning-best-practice.md: repair the garbled operator list and push-down description — （ TableFullScan_18）Selection_19TiKV（StreamAgg_9で… → （TableFullScan_18、Selection_19、StreamAgg_9）はTiKV（cop[tikv]）にプッシュダウンされ….
• external-storage-uri.md: remove the duplicated IAM in IAMIAM (3 occurrences).
• br/br-pitr-manual.md, br/br-snapshot-manual.md: translate the leftover English word storage → ストレージ; add を before 参照.
• br/br-snapshot-architecture.md: drop the duplicated テーブルデータ before the link.
• best-practices/uuid.md: repair 次のようになりますab06…は36文字 → （例えばab06…）は36文字.
• develop/dev-guide-aws-appflow-integration.md: add the missing topic marker after the leading link ([Amazon AppFlow](url)は、…).
• alert-rules.md, dr-secondary-cluster.md, develop/dev-guide-choose-driver-or-orm.md: remove the stray verb machine translation appended after link text ([サポートを受ける](/support.md)取得してください → [サポートを受けて](/support.md)ください).
• releases/release-4.0-ga.md: add missing を (hintを使用 / ストリーム集約を強制) and move the PR reference to the end of the sentence.
• releases/release-4.0.15.md: repair …を使用します。3 SHOW TABLE STATUS一部の… → …を使用します。これは、SHOW TABLE STATUSが一部の….
• Remaining files: add missing particles and remove stray trailing punctuation ( 。, .) after reference links.

Scope note: the stray-number removals are owned by #23275, so this PR no longer touches data-type-date-and-time.md. Verified that no line changed here is also changed by #23275 (0 overlapping lines).

Links that still lack を in the touched lines are intentionally left to #23273, which covers particles after Markdown links.

• Might cause conflicts after applied to another branch

Note on scope

A few of the lines in this PR also carry a fix that belongs to one of the sibling ja PRs. Where a later sweep found damage on a line this PR already edits, the fix was applied here rather than duplicated into another PR — otherwise the two PRs would conflict. So a small number of lines go beyond the scope stated above, for example:

-…発生します。1パラメータ`gc.max_write_bytes_per_sec`使用すると、…
+…発生します。`gc.max_write_bytes_per_sec`パラメータを使用すると、…

Here the stray 1 (a translation-tool placeholder) and the word order were repaired alongside this PR's particle insertion.

All fifteen ja PRs were verified to merge cleanly in any order (105 pairwise merges, 0 conflicts).

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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)

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