doc: Add links to disable-io-romio option

Added links to other documents explaining ROMIO

Signed-off-by: William Zhang <wilzhang@amazon.com>

Author: wckzhang

docs/installing-open-mpi/configure-cli-options/mpi.rst

@@ -75,7 +75,9 @@ MPI API behaviors that can be used with ``configure``:
   component
 
 * ``--disable-io-romio``:
-  Disable the ROMIO MPI-IO component
+  Disable the :ref:`ROMIO MPI-IO <label-romio-reference>` component
+  from being compiled.This is an outdated mechanism and functions
+  similarly to ``--enable-mca-no-build`` for the romio341 component.
 
 * ``--with-io-romio-flags=FLAGS``:
   Pass ``FLAGS`` to the ROMIO distribution configuration script.  This

docs/mca.rst

@@ -68,6 +68,8 @@ The following *projects* exist in Open MPI |ompi_ver|:
           See :ref:`the role of PMIx and PRRTE
           <label-running-role-of-pmix-and-prte>` for more information.
 
+.. _label-mca-frameworks:
+
 Frameworks
 ^^^^^^^^^^
 
@@ -94,6 +96,8 @@ between different versions of Open MPI.  You can use the
 :ref:`ompi_info(1) <man1-ompi_info>` command to see the full list of
 frameworks that are included in Open MPI |ompi_ver|.
 
+.. _label-mca-components:
+
 Components
 ^^^^^^^^^^
 
@@ -111,6 +115,8 @@ not all of them may be present or available on your system.  You can
 use the :ref:`ompi_info(1) <man1-ompi_info>` command to see what
 components are included in Open MPI |ompi_ver| on your system.
 
+.. _label-mca-modules:
+
 Modules
 ^^^^^^^
 

docs/tuning-apps/mpi-io/romio.rst

@@ -1,6 +1,12 @@
+.. _label-romio-reference:
+
 ROMIO
 =====
 
 ROMIO is an implementation of the MPI I/O functions defined in version
 two of the Message Passing Interface specification.  It has been
 ported over to Open MPI from `MPICH <https://mpich.org/>`_.
+
+It is utilized through the ``romio341`` :ref:`component
+<label-mca-components>` as an implementation of
+the ``io`` :ref:`framework <label-mca-frameworks>`