setup: improve FastRTPS install command

This way we abort on error and don't end up in a directory if something
fails.

Author: julianoes

en/setup/dev_env_linux_ubuntu.md

@@ -111,10 +111,8 @@ tar -xzf requiredcomponents/eProsima_FastCDR-1.0.7-Linux.tar.gz
 > **Note** In the following lines where we compile the FastCDR and FastRTPS libraries, the `make` command is issued with the `-j2` option. This option defines the number of parallel threads (or `j`obs) that are used to compile the source code. Change `-j2` to `-j<number_of_cpu_cores_in_your_system>` to speed up the compilation of the libraries.
 
 ```sh
-cd eProsima_FastCDR-1.0.7-Linux; ./configure --libdir=/usr/lib; make -j2; sudo make install
-cd ..
-cd eProsima_FastRTPS-1.5.0-Linux; ./configure --libdir=/usr/lib; make -j2; sudo make install
-cd ..
+(cd eProsima_FastCDR-1.0.7-Linux && ./configure --libdir=/usr/lib && make -j2 && sudo make install)
+(cd eProsima_FastRTPS-1.5.0-Linux && ./configure --libdir=/usr/lib && make -j2 && sudo make install)
 rm -rf requiredcomponents eprosima_fastrtps-1-5-0-linux.tar.gz
 ```