Add link generation for function names

[projectkk2glider]

If a function name (different from the current function) is found in a function documentation, replace it with a link to that function.

Example: in module.setModule() docs, replace reference to module.getModule() with a link syntax [module.getModule()](model/getModule.md)

Only do replace if the actual documentation for that function exists (has been parsed in the current script run).