i18n(ja): restore literal SQL command syntax in system-variable-reference.md links

[yahonda]

What is changed, added or deleted? (Required)

The literal SQL command references SHOW [GLOBAL|SESSION] VARIABLES (99 occurrences) and CREATE [GLOBAL|SESSION] BINDING (2 occurrences) in system-variable-reference.md's "See also" link lists had been translated word-for-word into Japanese ([[グローバル|セッション]変数を表示] / [[グローバル|セッション]バインディングの作成]), turning literal command syntax a user would type verbatim into unreadable, non-functional prose. Restored to match the English source exactly (101 lines changed, 1 file).

Known benign conflict: this PR has an adjacent-line diff-context conflict with #23437 (both touch system-variable-reference.md, on consecutive lines within the same "See also" list — #23437 changes MySQLの互換性→MySQLとの互換性 on one line, this PR changes the next line). The actual changes don't overlap in content; it's a standard git 3-line-context collision, trivially resolved by a rebase whichever PR merges second.

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

• v8.5 (LTS)
• v8.1 (LTS)
• v7.5 (LTS)
• v7.1 (LTS)
• v6.5 (LTS)
• v6.1 (LTS)

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Add redirect rules
• Change the framework or the code logic of the repository

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[LGTM Timeline notifier]

Timeline:

• 2026-08-05 12:29:43.590999202 +0000 UTC m=+2617569.627094268: ☑️ agreed by qiancai.

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