Benchmarks: Improve formatting of code

benchmarks/README.md

@@ -14,9 +14,11 @@ and run the same benchmarks again.
 
 For running benchmarks you can use on Unix:
 
-    make benchmark_<filename>_callgrind
+```sh
+make benchmark_<filename>_callgrind
+```
 
-which will run the callgrind tool of Valgrind on it.
+which will run the `callgrind` tool of Valgrind on it.
 
 The old STATISTICS file is no longer used and will be
 removed with this commit.
@@ -28,18 +30,24 @@ to generate a file containing the seeds. The number of seeds vary, execute the
 `benchmark_opmphm` without parameter to get the number of seeds.
 Then execute:
 
-    cat <fileWithSeeds> | benchmark_opmphm <benchmark>
+```sh
+cat <fileWithSeeds> | benchmark_opmphm <benchmark>
+```
 
 Example:
 
 To run the OPMPHM build time benchmark you need 2008 seeds.
 First generate the seeds:
 
-    scripts/generate-seeds 2008 mySeedFile
+```sh
+scripts/generate-seeds 2008 mySeedFile
+```
 
 Then pass it to the benchmark:
 
-    cat mySeedFile | benchmark_opmphm opmphmbuildtime
+```sh
+cat mySeedFile | benchmark_opmphm opmphmbuildtime
+```
 
 ## plugingetset