ShowParamterHelp is bound to Alt+h by default which doesn't work on macOS

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@theJasonHelmick is already working on this.

Since Feb 24, 2021.

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Description

Area-KeyHandlers Issue-KeyboardLayout OS-macOS

Environment

PS version: 7.2.0-preview.3
PSReadline version: 2.2.0-beta2
os: Darwin mmomalife.northamerica.corp.microsoft.com 20.3.0 Darwin Kernel Version 20.3.0: Thu Jan 21 00:07:06 PST 2021; root:xnu-7195.81.3~1/RELEASE_X86_64 x86_64
PS file version: 7.2.0.0
HostName: ConsoleHost
BufferWidth: 381
BufferHeight: 94

By default 2.2-beta2 binds Alt+h to ShowParameterHelp, but Alt+h on macOS prints Unicode 0xCB99 instead of calling the key handler. There is already an issue with .NET in not catching some keyboard combinations correctly on Unix systems. For now, it may make sense to pick a different default binding that works on Windows and Linux/macOS. Perhaps F2?

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