Fix typo in CMake option's description

FullSimLight/CMakeLists.txt

@@ -67,7 +67,7 @@ endif()
 # Support for the HepMC3 exchange format
 # This is ON by default, but it can be disabled by the user if not used/needed,
 # or if HepMC3 is not installed.
-option(GEOMODEL_USE_HEPMC3 "Buil GeoModel tools with support for the HepMC3 exchancge format (Note: HepMC3 must be installed on the target machine)" ON)
+option(GEOMODEL_USE_HEPMC3 "Build GeoModel tools with support for the HepMC3 exchancge format (Note: HepMC3 must be installed on the target machine)" ON)
 if(GEOMODEL_USE_HEPMC3)
     find_package(HepMC3 REQUIRED) # required by default, but it can be disabled 
 endif()