[docs/userguide/simulating_the_processor] add admonition and recommend MARCH=rv32im to build hello_world #819
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As discussed in #816, this PR brings a couple of enhancements to the Simulation section of the User Guide.
On the one hand, an admonition is added for users to know that using instructions corresponding to unsupported/disabled extensions will make the processor hung and the simulation will timeout.
On the other hand, the recommended MARCH to build hello_world is changed not to use extension C, since that's disabled in the simple testbench.