i18n(ja): fix mistranslated section headings (Implementation principles, Command)

[yahonda]

What is changed, added or deleted? (Required)

Fix machine-translation mistakes in section headings. Heading text only is changed; the {#...} anchors are kept so existing links still resolve.

1. "Implementation principles" → 実装原理 (13 files)

実施 means "to carry out / enforce a measure" and is wrong for software implementation; the correct word is 実装. These sections describe how each feature works internally, so the heading becomes 実装原理.

Files: auto-increment.md, br/br-checkpoint-restore.md, clinic/clinic-introduction.md, configure-load-base-split.md, configure-store-limit.md, dm/dm-manage-schema.md, dm/feature-shard-merge-optimistic.md, sql-statements/sql-statement-flashback-table.md, sql-statements/sql-statement-recover-table.md, tidb-distributed-execution-framework.md, tidb-global-sort.md, tiflash/tiflash-mintso-scheduler.md, tikv-in-memory-engine.md.

2. "Command" → コマンド (3 files)

指示 means "instruction/directive" and is a mistranslation of the English heading "Command". Corrected to コマンド.

Files: dm/dm-manage-schema.md, dm/manually-handling-sharding-ddl-locks.md, pd-control.md.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)

What is the related PR or file link(s)?

N/A — cleanup of legacy MT heading mistranslations on the ja translation branch.

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