Clarify ambiguity about how to ask Cargo for a specific version #30144
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The documentation shows this:
and says it allows any version compatible with 0.3.0, but then it says, "If we wanted to use only 0.3.0 exactly, we could use
=0.3.0
." That is very easy to misunderstand, so hopefully this PR will help others not to be as confused as me. :-)