Elaborate on open flag

Author: nojaf

pages/docs/manual/latest/build-configuration.mdx

@@ -192,8 +192,7 @@ The warning numbers are shown in the build output when they're triggered. See [W
 
 Extra flags to pass to the compiler. For advanced usages.
 
-- `-open ABC` opens the module `ABC` for each file in the project.
-- `-w -45` enable or disable certain compiler warnings. In this example, `-45` means to disable warning number 45.
+- `-open ABC` opens the module `ABC` for each file in the project. `ABC` can either be a dependency, namespaced project or local module of the current project.
 
 ## gentypeconfig