[build] Disable MSCCL++ compilation by default (#1879)

* Enable MSCCLPP on request

* Updating docs and README

* Updates to CHANGELOG.md

* Update CHANGELOG.md

Co-authored-by: Jeffrey Novotny <jnovotny@amd.com>

* Updates to CHANGELOG.md

* Update CHANGELOG.md

Co-authored-by: corey-derochie-amd <161367113+corey-derochie-amd@users.noreply.github.com>

* Update CHANGELOG.md

Github didn't take the edit to my suggestion properly.

---------

Co-authored-by: amd <amd@super3.amd.com>
Co-authored-by: Jeffrey Novotny <jnovotny@amd.com>
Co-authored-by: corey-derochie-amd <161367113+corey-derochie-amd@users.noreply.github.com>

docs/install/installation.rst

@@ -57,7 +57,7 @@ The RCCL build and installation helper script options are as follows:
        --enable_backtrace      Build with custom backtrace support
        --disable-colltrace     Build without collective trace
        --disable-msccl-kernel  Build without MSCCL kernels
-       --disable-mscclpp       Build without MSCCL++ support
+       --enable-mscclpp        Build with MSCCL++ support
     -f|--fast                  Quick-build RCCL (local gpu arch only, no backtrace, and collective trace support)
     -h|--help                  Prints this help message
     -i|--install               Install RCCL library (see --prefix argument below)