Add slide for compiler flags example

lectures/debugging-strategies/slides.qmd

@@ -458,9 +458,12 @@ In the Fortran world, also
 For Fortran programs try with more than just one compiler.
 HPC systems usally provide native compiler plus gcc/gfortan. Try both variants.
 
-$\Rightarrow$_Example program with issue illustrating the compiler flags_
 
-$\Rightarrow$_Show use of `gdb`_
+## Compiler flags example
+
+_Example program with issue illustrating the compiler flags_
+
+TODO
 
 
 ## Fixing run-time errors