[SPARK-26288][CORE][FOLLOW-UP][DOC] Fix broken tag in the doc.
[SPARK-26288][CORE][FOLLOW-UP][DOC] Fix broken tag in the doc.

## What changes were proposed in this pull request?

This pr is a follow-up of #23393.
The HTML in the doc is broken so fixing the broken `code` tag.

## How was this patch tested?

Existing tests.

Closes #24216 from ueshin/issues/SPARK-26288/fix_doc.

Authored-by: Takuya UESHIN <f070f8f0c50caeda5841963fc7b57e73e59dad56@databricks.com>
Signed-off-by: Hyukjin Kwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

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