doc: Fix typo in cmake

README.md

@@ -70,7 +70,7 @@ mkdir build
 cd build
 # Please change the path to the install dir. If you chose a global install you can omit the CMAKE_PREFIX_PATH option
 # You can specify which EtherCAT devices should be included into the build with -DECAT_DEVICE="sock_raw+sock_raw_mmaped+..."
-cmake .. -DCMAKE_PREFIX_PATH=<installdir of libosal> -DECAT_DEVICE="sock_raw+sock_raw_mmaped"
+cmake -DCMAKE_PREFIX_PATH=<installdir of libosal> -DECAT_DEVICE="sock_raw+sock_raw_mmaped" ..
 cmake --build . 
 ```