i18n(ja): remove spurious 番目/目 ordinals mistranslated from "the X <noun>"

[yahonda]

What is changed, added or deleted? (Required)

This PR fixes a systematic machine-translation artifact in the Japanese documentation where English "the X <noun>" (with X a code span — a keyword, column, function, parameter, phase, etc.) was mistranslated as "X番目の<noun>" (which reads "the X-th <noun>") or with a stray 目 (文字目 / 桁目 / 行目). The spurious ordinal reverses or distorts the meaning.

For example:

-`JSON_LENGTH(json_doc [,path])`番目の関数はJSONドキュメントの長さを返します。
+`JSON_LENGTH(json_doc [,path])`関数はJSONドキュメントの長さを返します。

• Each occurrence was cross-checked against the release-8.5 English source. Genuine ordinals are kept (e.g. n番目 where the English really says "the n-th value / the N-th physical plan / the n-th node"); only the spurious ones were removed.
• Scope: 99 fixes across ~70 files; only the spurious 番目/目 text is removed — nothing else on the line is touched.

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

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

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

• This PR is translated from: N/A (Japanese-only fluency fix; no English source change)
• Other reference link(s): part of the ja i18n-ja-release-8.5 machine-translation cleanup series

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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