docs(pytest): add note about filtering with test-case-name

docs/en/contribute/esp-idf-tests-with-pytest.rst

@@ -627,6 +627,8 @@ Filter the Test Cases
 
    In other cases, pytest would run all the test cases with sdkconfig file ``sdkconfig.ci.<sdkconfig>``.
 
+-  Filter by test-case name with ``pytest -k <test-case name>`` to run a single test-case, e.g. ``pytest -k test_int_wdt_cache_disabled``.
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 Add New Markers
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docs/zh_CN/contribute/esp-idf-tests-with-pytest.rst

@@ -627,6 +627,8 @@ CI 用于执行所有相关测试的命令为： ``pytest <parent_dir> --target
 
    如果是其他情况，pytest 会执行所有 sdkconfig 文件包含 ``sdkconfig.ci.<sdkconfig>`` 的测试用例。
 
+- 使用 ``pytest -k <test-case name>`` 按测试用例名称筛选，可以运行单个测试用例，例如 ``pytest -k test_int_wdt_cache_disabled``。
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 添加新 marker
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