Fix compiling instructions

Author: bwatters-r7

documentation/modules/exploit/windows/local/cve_2017_8464_lnk_lpe.md

@@ -160,5 +160,7 @@ Server username: NT AUTHORITY\SYSTEM
 ```
 
 ## Compiling instructions
-Run `data/exploits/cve-2017-8464/src/build.sh`
+`cd ./external/source/exploits/cve-2017-8464`
+`./build.sh`
+
 (Requires `mingw-w64` package)