[trace] Fix readme error.

components/trace/readme.md

 ##How to use the Segger SystemView trace componment
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+
 ### 1. Copy description file
 Copy the '.\SystemView_Src_Vxxx\Description\SYSVIEW_RTThread.txt' to folder '%SystemView_Install_Folder%\Description\'.
 ### 2. Enable trace componment
@@ -15,7 +15,7 @@ Segger SystemView only support Segger J-Link and Segger J-Link OB. If you using
 * For Atmel EDBG, here is the [EDBG upgrade utility download page](https://www.segger.com/jlink-edbg.html)
 * For Freescale(NXP) OpenSDA/OpenSDA-V2, here is the [OpenSDA upgrade utility download page](https://www.segger.com/opensda.html)
 * For NXP LPC Link 2, here is the [LPC link 2 upgrade utility download page](https://www.segger.com/lpc-link-2.html)
-* NXP LPCXpresso, here is the [LPC link 2 upgrade utility download page](https://www.segger.com/jlink-lpcxpresso-ob.html)
+* NXP LPCXpresso, here is the [LPCXpresso upgrade utility download page](https://www.segger.com/jlink-lpcxpresso-ob.html)
 
 ### 4. Intergration (Porting) limitation