docs: updata BoAT_User_Guide_en.md
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@@ -973,7 +973,7 @@ For modules using RTOS, you should add a call package to the module's http/https
###### 2. Remove Dependence on The File System
-The SDK uses files as a persistent storage method for the wallet. If the RTOS does not support the file system, you should modify the file operation related `BoatGetFileSize`, `BoatWriteFile`, `BoatReadFile`, `BoatRemoveFile` in \<SDKRoot\>/vendor/platform/\<platform_name\>/port_xx/boatplatform_internal.c Four functions, modify the read/write file to the persistence method supported by the system.
+The SDK uses files as a persistent storage method for the wallet. If the RTOS does not support the file system, you should modify the file operation related to `BoatGetFileSize` , `BoatWriteFile` , `BoatReadFile` , `BoatRemoveFile` ,from \<SDKRoot\>/vendor/platform/\<platform_name\>/port_xx/boatplatform_internal.c, modify the read/write file to the persistence method supported by the system.
###### 3. Memory Trimming
