update docs

Signed-off-by: Nshawn_he <shawn.he@huawei.com>

en/application-dev/reference/apis/js-apis-thermal.md

-# Thermal Management
+# Thermal Manager
 
 > ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
 > The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 
+The Thermal Manager module provides APIs for listening to the device thermal status.
+
 
 ## Modules to Import
 
@@ -15,15 +17,15 @@ import thermal from '@ohos.thermal';
 
 Represents the thermal level.
 
-| Name| Default Value| Description|
-| -------- | -------- | -------- |
-| COOL | 0 | The device is cool, and services are not restricted.|
-| NORMAL | 1 | The device is operational but is not cool. You need to pay attention to its heating.|
-| WARM | 2 | The device is warm. You need to stop or delay some imperceptible services.|
-| HOT | 3 | The device is heating up. You need to stop all imperceptible services and downgrade or reduce the load of other services.|
-| OVERHEATED | 4 | The device is overheated. You need to stop all imperceptible services and downgrade or reduce the load of major services.|
-| WARNING | 5 | The device is overheated and is about to enter the emergency state. You need to stop all imperceptible services and downgrade major services to the maximum extent.|
-| EMERGENCY | 6 | The device has entered the emergency state. You need to stop all services except those for the emergency help purposes.|
+| Name        | Default Value  | Description                                      |
+| ---------- | ---- | ---------------------------------------- |
+| COOL       | 0    | The device is cool, and services are not restricted.<br>**System capability:** SystemCapability.PowerManager.ThermalManager|
+| NORMAL     | 1    | The device is operational but is not cool. You need to pay attention to its heating.<br>**System capability:** SystemCapability.PowerManager.ThermalManager|
+| WARM       | 2    | The device is warm. You need to stop or delay some imperceptible services.<br>**System capability:** SystemCapability.PowerManager.ThermalManager|
+| HOT        | 3    | The device is heating up. You need to stop all imperceptible services and downgrade or reduce the load of other services.<br>**System capability:** SystemCapability.PowerManager.ThermalManager|
+| OVERHEATED | 4    | The device is overheated. You need to stop all imperceptible services and downgrade or reduce the load of major services.<br>**System capability:** SystemCapability.PowerManager.ThermalManager|
+| WARNING    | 5    | The device is overheated and is about to enter the emergency state. You need to stop all imperceptible services and downgrade major services to the maximum extent.<br>**System capability:** SystemCapability.PowerManager.ThermalManager|
+| EMERGENCY  | 6    | The device has entered the emergency state. You need to stop all services except those for the emergency help purposes.<br>**System capability:** SystemCapability.PowerManager.ThermalManager|
 
 
 ## thermal.subscribeThermalLevel
@@ -32,19 +34,18 @@ subscribeThermalLevel(callback: AsyncCallback&lt;ThermalLevel&gt;): void
 
 Subscribes to thermal level changes.
 
-**System Capabilities**
-
-SystemCapability.PowerManager.ThermalManager
+**System capability:** SystemCapability.PowerManager.ThermalManager
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| callback | AsyncCallback&lt;ThermalLevel&gt; | Yes| Callback used to obtain the return value. <br/>Return value: thermal level|
+| Name     | Type                               | Mandatory  | Description                                      |
+| -------- | --------------------------------- | ---- | ---------------------------------------- |
+| callback | AsyncCallback&lt;ThermalLevel&gt; | Yes   | Callback used to obtain the return value.<br>Return value: thermal level|
 
 **Example**
 
 ```
+var lev = 0;
 thermal.subscribeThermalLevel((lev) => {
     console.info("Thermal level is: " + lev);
 })
@@ -52,19 +53,17 @@ thermal.subscribeThermalLevel((lev) => {
 
 ## thermal.unsubscribeThermalLevel
 
-unsubscribeThermalLevel(callback?: AsyncCallback<void>): void
+unsubscribeThermalLevel(callback?: AsyncCallback\<void>): void
 
 Unsubscribes from thermal level changes.
 
-**System Capabilities**
-
-SystemCapability.PowerManager.ThermalManager
+**System capability:** SystemCapability.PowerManager.ThermalManager
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| callback | AsyncCallback&lt;void&gt; | No| Callback without a return value.|
+| Name     | Type                       | Mandatory  | Description                   |
+| -------- | ------------------------- | ---- | --------------------- |
+| callback | AsyncCallback&lt;void&gt; | No  | Callback without a return value.|
 
 **Example**
 
@@ -80,14 +79,12 @@ getThermalLevel(): ThermalLevel
 
 Obtains the current thermal level.
 
-**System Capabilities**
-
-SystemCapability.PowerManager.ThermalManager
+**System capability:** SystemCapability.PowerManager.ThermalManager
 
-**Return value**
+**Return value**:
 
-| Type| Description|
-| -------- | -------- |
+| Type          | Description    |
+| ------------ | ------ |
 | ThermalLevel | Thermal level obtained.|
 
 **Example**