Fix how to set BOOST_ROOT (#8894)

## Summary of Changes

We require at least 1.74, but we gave an example with 1.70
We did not give the path to the boost cmake config file.   

## Release Management

* Affected package(s): documentation
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Sebastien Loriot 2025-06-26 21:46:20 +02:00 committed by GitHub
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@ -69,8 +69,9 @@ For Visual C++ you can download precompiled libraries
from <A HREF="https://sourceforge.net/projects/boost/files/boost-binaries/">`https://sourceforge.net/projects/boost/files/boost-binaries/`</A>.
As there is no canonical directory for where to find \boost on Windows,
we recommend that you define the environment variable
`BOOST_ROOT` and set it to where you have installed \boost, e.g., `C:\boost\boost_1_70_0`.
we recommend to use the config mode of CMake by defining the environment variable
`Boost_DIR` (case sensitive) to the path of the directory in your boost installation
containing the file `BoostConfig.cmake`, e.g.`C:/local/boost_1_80_0/lib64-msvc-14.3/cmake/Boost-1.80.0`.
\subsection thirdpartyMP Multi Precision Number Type Library