docs: Fixup format of a command line to build unit tests

docs/en/api-guides/unit-tests.rst

@@ -194,8 +194,8 @@ Change into ``tools/unit-test-app`` directory to configure and build it:
 * ``idf.py menuconfig`` - configure unit test app.
 
 * ``idf.py -T all build`` - build unit test app with tests for each component having tests in the ``test`` subdirectory.
-* ``idf.py -T xxx build`` - build unit test app with tests for specific components.
-* ``idf.py -T all -E xxxbuild`` - build unit test app with all unit tests, except for unit tests of some components. (For instance: ``idf.py -T all -E ulp mbedtls build`` - build all unit tests exludes ``ulp`` and ``mbedtls`` components).
+* ``idf.py -T "xxx yyy" build`` - build unit test app with tests for some space-separated specific components (For instance: ``idf.py -T heap build`` - build unit tests only for ``heap`` component directory).
+* ``idf.py -T all -E "xxx yyy" build`` - build unit test app with all unit tests, except for unit tests of some components (For instance: ``idf.py -T all -E "ulp mbedtls" build`` - build all unit tests exludes ``ulp`` and ``mbedtls`` components).
 
 When the build finishes, it will print instructions for flashing the chip. You can simply run ``idf.py flash`` to flash all build output.
 

docs/zh_CN/api-guides/unit-tests.rst

@@ -193,11 +193,11 @@ DUT2（slave）终端：
 -  ``idf.py -T all build`` - 编译单元测试程序，测试每个组件 ``test``
    子目录下的用例。
 
--  ``idf.py -T xxx build`` - 编译单元测试程序，测试指定的组件。
+-  ``idf.py -T "xxx yyy" build`` - 编译单元测试程序，测试指定的组件。
 
--  ``idf.py -T all -E xxxbuild`` -
+-  ``idf.py -T all -E "xxx yyy" build`` -
    编译单元测试程序，测试所有（除开指定）的组件。（例如
-   ``idf.py -T all -E ulp mbedtls build`` -
+   ``idf.py -T all -E "ulp mbedtls" build`` -
    编译所有的单元测试，不包括 ``ulp`` 和 ``mbedtls`` 组件。）
 
 当编译完成时，它会打印出烧写芯片的指令。您只需要运行 ``idf.py flash``