[docs] Add a reference to "debug mode" in assert.md

[TomSaw]

No description provided.

[rleh]

Your link links to the scons bud system documentation, but the debug mode is build system independent.
There is this page (https://modm.io/reference/module/modm-build/), but it does not explain how to use the debug/release build modes.
I'm not sure what the best solution is.

[salkinium]

Yeah, good point.

1. This should probably be "debug profile", to avoid confusion with using the debugger (eg. scons debug).
2. There should be a section above "Compiler Options" in https://modm.io/reference/module/modm-build/ that says we have two profiles: release and debug and that they can be selected with the profile=release argument to make and scons (CMake has their own definitions).

[TomSaw]

2. There should be a section above "Compiler Options" in https://modm.io/reference/module/modm-build/ that says we have two profiles: release and debug and that they can be selected with the profile=release argument to make and scons (CMake has their own definitions).

There's even an empty promise in the scons and make docs:

For a description of the release and debug profiles, see the modm:build module documentation.

However, I found clarification in the specific scons and make docs and think this reference is good enough.

[salkinium]

Thank you!