add maxThreads param

Author: tony-xlh

_articles/info/api/WebTwain_IO.md

@@ -3820,6 +3820,7 @@ saveToLocalStorage(
   settings:{
     uid: string;
     password?: string;
+    maxThreads?: number;
     indices?: number[];
   }
 ): Promise<string[]>;
@@ -3831,6 +3832,7 @@ saveToLocalStorage(
 
 - `uid`: Specify the storage folder to save the images cache.
 - `password`: The password of the specified storage folder.
+- `maxThreads`: The maximum number of threads used for saving. You can set this to improve the speed. The default value is 1.
 - `indices`: Specify the indices to save.
     - If not set, means all images in buffer.
     - If set to `[]`, all cache in the specified storage folder will be clear.
@@ -3887,6 +3889,7 @@ loadFromLocalStorage (
     settings:{
         uid: string;
         password?:string;
+        maxThreads?: number;
     }
 ): Promise<{oriImageId: string, newImageId: string}[]>;
 ```
@@ -3897,6 +3900,7 @@ loadFromLocalStorage (
 
 - `uid`: Specify the storage folder to load the images.
 - `password`: The password of the specified storage folder.
+- `maxThreads`: The maximum number of threads used for loading. You can set this to improve the speed. The default value is 1.
 
 **Return value**