Updating comments

Signed-off-by: Stephen Brawner <brawner@gmail.com>

include/rcutils/testing/fault_injection.h

@@ -36,15 +36,14 @@ bool
 rcutils_fault_injection_is_test_complete(void);
 
 /**
- * \def RCUTILS_FAULT_INJECTION_SET_COUNT
  * \brief Atomically set the fault injection counter.
  *
- * There will be at most one fault injected failure per call to RCUTILS_FAULT_INJECTION_SET_COUNT.
+ * There will be at most one fault injected failure per call to `rcutils_fault_injection_set_count`.
  * To test all reachable fault injection locations, call this macro inside a loop and set the count
  * to an incrementing count variable.
  *
  *  for (int i = 0; i < SUFFICIENTLY_LARGE_ITERATION_COUNT; ++i) {
- *    RCUTILS_FAULT_INJECTION_SET_COUNT(i);
+ *    rcutils_fault_injection_set_count(i);
  *    ... // Call function under test
  *  }
  * ASSERT_LT(RCUTILS_FAULT_INJECTION_NEVER_FAIL, RCUTILS_FAULT_INJECTION_GET_COUNT());
@@ -69,20 +68,25 @@ void
 rcutils_fault_injection_set_count(int count);
 
 /**
- * \def RCUTILS_FAULT_INJECTION_GET_COUNT
  * \brief Atomically get the fault injection counter value
  *
- * Use this macro after running the code under test to check whether the counter reached a negative
- * value. This is helpful so you can verify that you ran the fault injection test in a loop a
- * sufficient number of times. Likewise, if the code under test returned with an error, but the
- * count value was greater or equal to 0, then the failure was not caused by the fault injection
- * counter.
+ * Use this function after running the code under test to check whether the counter reached a
+ * negative value. This is helpful so you can verify that you ran the fault injection test in a
+ * loop a sufficient number of times. Likewise, if the code under test returned with an error, but
+ * the count value was greater or equal to 0, then the failure was not caused by the fault
+ * injection counter.
  */
 RCUTILS_PUBLIC
 RCUTILS_WARN_UNUSED
 int_least64_t
 rcutils_fault_injection_get_count(void);
 
+/**
+ * \brief Implementation of fault injection decrementer
+ *
+ * This is included inside of macros, so it needs to be exported as a public function, but it
+ * should not be used directly.
+ */
 RCUTILS_PUBLIC
 RCUTILS_WARN_UNUSED
 int_least64_t