docs: Fix snippet with example cmake build command to create mocks

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

@@ -306,7 +306,7 @@ of time spent on waiting for code/data in case of a cache miss, then subtract th
 One limitation of the cache compensated timer is that the task that benchmarked functions should be pinned to a core. This is due to each core having its own event counters that are independent of each other. For example, if ``ccomp_timer_start`` gets called on one core, put to sleep by the scheduler, wakes up, and gets rescheduled on the other core, then the corresponding ``ccomp_timer_stop`` will be invalid.
 
 Mocks
------------------------------------------
+-----
 
 ESP-IDF has a component which integrates the CMock mocking framework.
 CMock usually uses Unity as a submodule, but due to some Espressif-internal limitations with CI, we still have Unity as an ordinary module in ESP-IDF.
@@ -316,7 +316,7 @@ Refer to :component_file:`cmock/CMock/lib/cmock_generator.rb` to see how the Uni
 
 An example cmake build command to create mocks of a component inside that component's CMakeLists.txt may look like this:
 
-  .. code-block:: cmake
+.. code-block:: cmake
 
   add_custom_command(
     OUTPUT ${MOCK_OUTPUT}