Clarify Mox.allow/3 usage with deferred functions - #166
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When testing a process that calls a mock inside its init/1, I ran into an Mox.UnexpectedCallError because the process wasn’t yet started when defining Mox.allow/3.
The fix was to use a deferred function with Mox.allow/3, so that Mox resolves the process later when the mock is actually invoked.
This change updates the docs to clarify that deferred functions can be used in such cases.