Standardize power-save-blocker

docs/api/power-save-blocker.md

@@ -1,9 +1,10 @@
-# power-save-blocker
+# powerSaveBlocker
 
 The `power-save-blocker` module is used to block the system from entering
-low-power(sleep) mode, allowing app to keep system and screen active.
+low-power (sleep) mode thus allowing the app to keep the system and screen
+active.
 
-An example is:
+For example:
 
 ```javascript
 var powerSaveBlocker = require('power-save-blocker');
@@ -14,35 +15,40 @@ console.log(powerSaveBlocker.isStarted(id));
 powerSaveBlocker.stop(id);
 ```
 
-## powerSaveBlocker.start(type)
+## Methods
 
-* `type` String - Power save blocker type
+The `powerSaveBlocker` module has the following methods:
+
+### `powerSaveBlocker.start(type)`
+
+* `type` String - Power save blocker type.
   * `prevent-app-suspension` - Prevent the application from being suspended.
-    Keeps system active, but allows screen to be turned off.  Example use cases:
-    downloading a file, playing audio.
-  * `prevent-display-sleep`- Prevent the display from going to sleep. Keeps system
-    and screen active.  Example use case: playing video.
+    Keeps system active but allows screen to be turned off.  Example use cases:
+    downloading a file or playing audio.
+  * `prevent-display-sleep`- Prevent the display from going to sleep. Keeps
+    system and screen active.  Example use case: playing video.
 
-Starts the power save blocker preventing the system entering lower-power mode.
-Returns an integer identified the power save blocker.
+Starts the power save blocker preventing the system from entering lower-power
+mode. Returns an integer identifying the power save blocker.
 
-**Note:**
-`prevent-display-sleep` has higher precedence level than `prevent-app-suspension`.
-Only the highest precedence type takes effect. In other words, `prevent-display-sleep`
-always take precedence over `prevent-app-suspension`.
+**Note:** `prevent-display-sleep` has higher has precedence over
+`prevent-app-suspension`. Only the highest precedence type takes effect. In
+other words, `prevent-display-sleep` always take precedence over
+`prevent-app-suspension`.
 
 For example, an API calling A requests for `prevent-app-suspension`, and
 another calling B requests for `prevent-display-sleep`. `prevent-display-sleep`
-will be used until B stops its request. After that, `prevent-app-suspension` is used.
+will be used until B stops its request. After that, `prevent-app-suspension`
+is used.
 
-## powerSaveBlocker.stop(id)
+### `powerSaveBlocker.stop(id)`
 
 * `id` Integer - The power save blocker id returned by `powerSaveBlocker.start`.
 
 Stops the specified power save blocker.
 
-## powerSaveBlocker.isStarted(id)
+### `powerSaveBlocker.isStarted(id)`
 
 * `id` Integer - The power save blocker id returned by `powerSaveBlocker.start`.
 
-Returns whether the corresponding `powerSaveBlocker` starts.
+Returns a boolean whether the corresponding `powerSaveBlocker` has started.