Apply suggestions from code review

Co-authored-by: Boris Zbarsky <bzbarsky@apple.com>

src/app/icd/server/ICDManager.cpp

@@ -458,7 +458,7 @@ void ICDManager::UpdateOperationState(OperationalState state)
             DeviceLayer::SystemLayer().StartTimer(activeModeDuration, OnActiveModeDone, this);
 
             Milliseconds32 activeModeJitterInterval = Milliseconds32(ICD_ACTIVE_TIME_JITTER_MS);
-            // TODO(#33074): Edge case when we transition to IdleMode with this conditio being true
+            // TODO(#33074): Edge case when we transition to IdleMode with this condition being true
             // (activeModeDuration == kZero && !mKeepActiveFlags.HasAny())
             activeModeJitterInterval =
                 (activeModeDuration >= activeModeJitterInterval) ? activeModeDuration - activeModeJitterInterval : kZero;

src/app/icd/server/ICDManager.h

@@ -108,7 +108,7 @@ class ICDManager : public ICDListener, public TestEventTriggerHandler
      * @param[in] feature FeatureMap bit to verify
      *
      * @return true: if the FeatureMap bit is enabled in the ICDM cluster attribute.
-     *         false: ff the FeatureMap bit is not enabled in the ICDM cluster attribute.
+     *         false: if the FeatureMap bit is not enabled in the ICDM cluster attribute.
      *                if we failed to read the FeatureMap attribute.
      */
     bool SupportsFeature(Clusters::IcdManagement::Feature feature);
@@ -186,21 +186,21 @@ class ICDManager : public ICDListener, public TestEventTriggerHandler
     /**
      * @brief UpdateICDMode checks in which ICDMode (SIT or LIT) the ICD can go to and updates the mode if necessary.
      *        For a SIT ICD, the function does nothing.
-     *        For a LIT ICD, the function checks if the ICD has a registration in the ICDMonitoringTable to determine in which
+     *        For a LIT ICD, the function checks if the ICD has a registration in the ICDMonitoringTable to determine which
      *        ICDMode the ICD must be in.
      */
     void UpdateICDMode();
 
     /**
      * @brief UpdateOperationState updates the OperationState of the ICD to the requested one.
      *        IdleMode -> IdleMode     : No actions are necessary, do nothing.
-     *        IdleMode -> ActiveMode   : Transition the device to ActiveMode, start the  ActiveMode timer and triggers all necessary
+     *        IdleMode -> ActiveMode   : Transition the device to ActiveMode, start the  ActiveMode timer and trigger all necessary
      *                                   operations. These operations could be : Send Check-In messages
      *                                                                           Send subscription reports
      *                                                                           Process user actions
      *        ActiveMode -> ActiveMode : Increase remaining ActiveMode timer to one ActiveModeThreshold.
      *                                   If ActiveModeThreshold is 0, do nothing.
-     *        ActiveMode -> IdleMode   : Transition ICD to IdleMode and starts the IdleMode timer.
+     *        ActiveMode -> IdleMode   : Transition ICD to IdleMode and start the IdleMode timer.
      *
      * @param state requested OperationalState for the ICD to transition to
      */
@@ -209,7 +209,7 @@ class ICDManager : public ICDListener, public TestEventTriggerHandler
     /**
      * @brief Set or Remove a keep ActiveMode requirement for the given flag
      *        If state is true and the ICD is in IdleMode, transition the ICD to ActiveMode
-     *        If state is false and the ICD is in ActiveMode, verifies if we can transition the ICD to IdleMode.
+     *        If state is false and the ICD is in ActiveMode, check whether we can transition the ICD to IdleMode.
      *        If we can, transition the ICD to IdleMode.
      *
      * @param flag KeepActiveFlag to remove or add

src/app/icd/server/ICDStateObserver.h

@@ -28,8 +28,8 @@ namespace chip {
 namespace app {
 
 /**
- * @brief Public API used my the ICDManager to expose when different events occurs.
- *        ICDManager::RegisterObserver can be used to register as an Observer to be notified when these events occurs.
+ * @brief Public API used by the ICDManager to expose when different events occur.
+ *        ICDManager::RegisterObserver can be used to register as an Observer to be notified when these events occur.
  *        These functions are called synchronously.
  */
 class ICDStateObserver