Fix Grafana dashboard script links

[wenxiaojie1]

Fixes #3157.

This replaces the templated raw GitHub branch URL used for get-grafana-dashboards.sh in both English and Chinese monitor docs with the current main branch URL, so the link checker can resolve it.

Validation:

• Verified https://raw.githubusercontent.com/pingcap/tidb-operator/main/hack/get-grafana-dashboards.sh returns HTTP 200.

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[pingcap-cla-assistant]

All committers have signed the CLA.

[qiancai]

/unapprove

[qiancai]

/lgtm cancel

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[LGTM Timeline notifier]

Timeline:

• 2026-06-30 04:51:24.526885163 +0000 UTC m=+101426.227264576: ☑️ agreed by qiancai.
• 2026-06-30 05:02:50.587474364 +0000 UTC m=+102112.287853777: ✖️🔁 reset by qiancai.

this change is unnecessary

[qiancai]

Hi @wenxiaojie1, thanks for creating this PR. However, this change is unnecessary because the error reported in #3157 is a false positive.

This error should not be triggered here, because the placeholder {{{ .tidb_operator_release_branch }}} will be automatically replaced with the corresponding release value before the Markdown document is rendered into HTML or PDF.

[wenxiaojie1]

Thanks for clarifying. That makes sense; I missed that this placeholder is replaced before the rendered HTML/PDF output is generated. No further changes from me on this PR.