Update SPINANDBlockDevice.h

Fix the spelling issue

Author: rogeryou

storage/blockdevice/COMPONENT_SPINAND/include/SPINAND/SPINANDBlockDevice.h

@@ -148,7 +148,7 @@ class SPINANDBlockDevice : public mbed::BlockDevice {
      */
     virtual int deinit();
 
-    /** Desctruct SPINANDBlockDevie
+    /** Destruct SPINANDBlockDevie
       */
     ~SPINANDBlockDevice()
     {
@@ -272,7 +272,7 @@ class SPINANDBlockDevice : public mbed::BlockDevice {
     /* Flash Configuration Functions */
     /*********************************/
 
-    // Quad Enable in Sercurity Register
+    // Quad Enable in Security Register
     int _set_quad_enable();
 
     // Clear the device's block protection