Add link and info on maintainer-clean

Signed-off-by: Jake Tronge <jtronge@lanl.gov>

Author: jtronge

docs/developers/bindings.rst

@@ -100,15 +100,23 @@ generated by the script:
 The Fortran file ``api_f08_generated.F90`` contains all the internal subroutine
 definitions, each of which makes a call into corresponding C functions. Two
 different C files are generated: ``api_f08_ts_generated.c`` contains support
-for compilers with TS 29113 support, allowing the use of ``CFI_cdesc_t`` types;
-and ``api_f08_generated.c`` for compilers without TS 29113 support. The
-internal subroutine names are mapped to the external interface, including
-multiple interfaces for the bigcount version of functions, in
-``mpi-f08-interfaces-generated.h``.
+for compilers with TS 29113 support, allowing the use of ``CFI_cdesc_t`` types
+(see `Fortran 2018`_ for more details); and ``api_f08_generated.c`` for
+compilers without TS 29113 support. The internal subroutine names are mapped to
+the external interface, including multiple interfaces for the bigcount version
+of functions, in ``mpi-f08-interfaces-generated.h``.
+
+.. _Fortran 2018: https://fortranwiki.org/fortran/show/Fortran+2018
 
 If a new type needs to be added, then one will need to extend
 ``fortran_type.py`` in ``ompi/mpi/bindings/ompi_bindings`` with an additional
 type class specifying how to handle the type in the above generated files,
 including any required key-value attributes for more complicated types. New
 types use a ``Type`` base class with functions that can be implemented by
 derived classes, each returning expanded Fortran or C code.
+
+Other Considerations
+--------------------
+
+Keep in mind that the generated files will not be deleted with a ``make clean``
+or ``make distclean``; instead use ``make maintainer-clean`` to delete those.