docs: remove mentions of 32-bit support

Also explicitly mention that 32-bit builds are no longer supported as
of v5.0.0.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

Author: jsquyres

docs/faq/supported-systems.rst

@@ -153,19 +153,6 @@ releases continually improve reliability and performance of
 multi-threaded MPI applications.
 
 
-/////////////////////////////////////////////////////////////////////////
-
-Does Open MPI support 32 bit environments?
-------------------------------------------
-
-As far as we know, yes.  64 bit architectures have effectively taken
-over the world, though, so 32-bit is not tested nearly as much as
-64-bit.
-
-Specifically, most of the Open MPI developers only have 64-bit
-machines, and therefore only test 32-bit in emulation mode.
-
-
 /////////////////////////////////////////////////////////////////////////
 
 Does Open MPI support 64 bit environments?

docs/release-notes/platform.rst

@@ -22,8 +22,7 @@ Platform Notes
 
 * Other systems have been lightly (but not fully) tested:
 
-  * Linux (various flavors/distros), 32 bit, with gcc
-  * Cygwin 32 & 64 bit with gcc
+  * Cygwin 64 bit with gcc
   * ARMv6, ARMv7, ARMv9
   * Other 64 bit platforms.
   * OpenBSD.  Requires configure options ``--enable-mca-no-build=patcher``
@@ -32,6 +31,8 @@ Platform Notes
     using the clang-4.0 system compiler. A workaround is to build
     Open MPI using the GNU compiler.
 
+.. note:: 32-bit environments are no longer supported.
+
 * The run-time systems that are currently supported are:
 
   * ssh / rsh