tutorials/cmake/commands.md: example with excluding modules

docs/tutorials/cmake/commands.md

@@ -25,6 +25,7 @@ cd build
 | `make cfg`  | `cmake ..`  | Generate config files for the build system |
 | `make PREFIX=/tmp/kamailio-dev cfg ` | `cmake -DCMAKE_INSTALL_PREFIX=/tmp/kamailio-dev ..` | Specify installation path prefix |
 | `make include_modules="app_lua db_mysql" cfg` | `cmake -DINCLUDE_MODULES="app_lua db_mysql" ..` | Specify additional modules to be included in compilation |
+| `make exclude_modules="app_lua db_mysql" cfg` | `cmake -DEXCLUDE_MODULES="app_lua db_mysql" ..` | Specify modules to be excluded from compilation |
 | `make`      | `make kamailio` | Compile `kamailio` binary (the core) |
 | `make all`  | `make` | Compile everything (core and modules) |
 | `make modules modules=src/modules/acc` | `make acc` | Compile `acc` modules (substitute with any other module name) |