add help for debug option for build_oai

cmake_targets/build_oai

@@ -83,7 +83,7 @@ Options
 --install-optional-packages
    Install useful but not mandatory packages such as valgrind
 -g | --run-with-gdb
-   Add debugging symbols to compilation directives. It also disables any compiler optimization.
+   Add debugging symbols to compilation directives. It also disables any compiler optimization. Only for debugging. Do not use in normal operation!
 -h | --help
    Print this help
 --eNB
@@ -137,9 +137,9 @@ Options
 --disable-hardware-dependency
    Disable HW dependency during installation
 Usage (first build):
- oaisim (eNB + UE): ./build_oai -I -g --oaisim -x --install-system-files
- Eurecom EXMIMO + COTS UE : ./build_oai -I -g --eNB -x --install-system-files
- NI/ETTUS B201  + COTS UE : ./build_oai -I -g --eNB -x --install-system-files -w USRP
+ oaisim (eNB + UE): ./build_oai -I  --oaisim -x --install-system-files
+ Eurecom EXMIMO + COTS UE : ./build_oai -I  --eNB -x --install-system-files
+ NI/ETTUS B201  + COTS UE : ./build_oai -I  --eNB -x --install-system-files -w USRP
 Usage (Regular):
  oaisim : ./build_oai --oaisim -x 
  Eurecom EXMIMO + OAI ENB : ./build_oai --eNB -x