[Feedback] Conan Advanced - A note about build_requires

The course tells to use build_requires only for tools or testing frameworks, but doesn't quite explain why with respect to the C/C++ context.

It could be useful to have a little explanation about Conan's graph solving ability and conflicting symbols in C++ binaries.

Start by locating the Conan Advanced course section that discusses build_requires. Read the surrounding guidance and add a concise explanation of Conan's graph solving and how conflicting symbols can affect C++ binaries. Done means the reason for limiting build_requires to tools or testing frameworks is clear in the course material.

Written by the indexing model from the issue text.