Minor fixes (proposal) (#241)

README.md

     go get github.com/google/pprof
 
 Remember to set GOPATH to the directory where you want pprof to be
-installed.  The binary will be in $GOPATH/bin and the sources under
-$GOPATH/src/github.com/google/pprof.
+installed.  The binary will be in `$GOPATH/bin` and the sources under
+`$GOPATH/src/github.com/google/pprof`.
 
 # Basic usage
 
 ## Using pprof with Linux Perf
 
 pprof can read `perf.data` files generated by the
-[Linux perf](https://perf.wiki.kernel.org/index.php) tool by using the
+[Linux perf](https://perf.wiki.kernel.org/index.php/Main_Page) tool by using the
 `perf_to_profile` program from the
-[perf_data_converter](http://github.com/google/perf_data_converter) package.
+[perf_data_converter](https://github.com/google/perf_data_converter) package.
 
 ## Further documentation