fix an error of qcloud sdk demo in quick start

1. use TencentOS-tiny\board\TencentOS_tiny_EVB_MX_plus\KEIL\qcloud_iot_explorer_sdk_data_template   instead of TencentOS-tiny\board\TencentOS_tiny_EVB_MX\KEIL\ tencent_cloud_sdk_data_template

arch/stm8/iccarm/port_s.S

@@ -65,14 +65,14 @@ _context_save:
     PUSH    ?b15
 
     /* k_curr_task->sp = SP */
-    LDW     X, k_curr_task  /* equls to: "ldr r0, =k_curr_task; ldr r0, [r0]" */
+    LDW     X, k_curr_task  /* equals to: "ldr r0, =k_curr_task; ldr r0, [r0]" */
     LDW     Y, SP
     LDW     (X), Y
 
 _context_restore:
     ; k_curr_task = k_next_task
     LDW     X, k_next_task
-    LDW     Y, #k_curr_task /* equls to: "ldr r0, =k_curr_task "*/
+    LDW     Y, #k_curr_task /* equals to: "ldr r0, =k_curr_task "*/
     LDW     (Y), X
 
     /* SP = k_next_task->sp */

doc/15.TencentOS_tiny_EVB_MX_Plus_Quick_Start.md

@@ -334,7 +334,7 @@ https://github.com/Tencent/TencentOS-tiny
   1. 打开 lightdemo 例程
 
     TencentOS tiny项目工程中包含了explorer的demo工程：
-    进入TencentOS-tiny\board\TencentOS_tiny_EVB_MX\KEIL\ tencent_cloud_sdk_data_template目录，双击TencentOS_tiny.uvprojx，用mdk打开。
+    进入TencentOS-tiny\board\TencentOS_tiny_EVB_MX_plus\KEIL\qcloud_iot_explorer_sdk_data_template目录，双击TencentOS_tiny.uvprojx，用mdk打开。
 
   2. 填写配置信息