doc: change var description

Author: fabinsch

CMakeLists.txt

@@ -36,8 +36,7 @@ endif()
 # --- OPTIONS  ---------------------------------------
 # Need to be set before including base.cmake
 # ----------------------------------------------------
-option(BUILD_DOCUMENTATION "Search for doxygen and generate the documentation."
-       OFF)
+option(BUILD_DOCUMENTATION "Build the documentation." OFF)
 option(INSTALL_DOCUMENTATION "Install the documentation" OFF)
 set(DOXYGEN_USE_MATHJAX YES)
 set(DOXYGEN_USE_TEMPLATE_CSS YES)