ticdc-alert-rules: update the description of ticdc_memory_abnormal to match English doc

[enkilee]

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• This PR is translated from: ticdc-alert-rules: change the heading level from H2 to H3 docs#15927
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[LGTM Timeline notifier]

Timeline:

• 2024-01-09 09:20:35.169930823 +0000 UTC m=+348624.754184502: ☑️ agreed by Oreoxmt.
• 2024-01-09 09:26:31.354441012 +0000 UTC m=+348980.938694699: ☑️ agreed by qiancai.

[Oreoxmt]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #16076.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.3: #16077.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.4: #16078.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16079.