doc: fixed incorrect link

docs/preparation.rst

@@ -43,7 +43,7 @@ shell, please update the commands accordingly.
 GOPATH
 ------
 The measurement applications, which control the behavior of the FlueNT10G
-network tester, are written in **Go**. When working with Go, we must set the
+network tester, are written in *Go*. When working with Go, we must set the
 `GOPATH` environment variable to point to the directory holding the source code
 and binary files of all Go projects. In this documentation, we set the `GOPATH`
 to `~/go` (which is actually the default value). Feel free to use any other
@@ -117,5 +117,5 @@ follow the instructions below to compile and set up the library:
 .. _Xilinx PCI Express DMA driver:
     https://github.com/Xilinx/dma_ip_drivers/tree/master/XDMA/linux-kernel
 .. _ZeroMQ: http://zeromq.org
-.. _GoPATH: https://github.com/golang/go/wiki/GOPATH
-__ GOPATH
+.. _GOPATH: https://github.com/golang/go/wiki/GOPATH
+__ GOPATH_