corrected Windows installation verification step instructions

[maxvol]

corrected Windows installation verification step instructions as discussed here -
#421

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[compnerd]

Hmm, so we want to have the different paths for Linux, Windows, and macOS? The commands as is do not really work on macOS (when I last tried) but required some extra flags. However, this looks good from the windows side.

[ematejska]

@maxvol Could you please sign the CLA?

[maxvol]

@maxvol Could you please sign the CLA?

@ematejska done! sorry for delay

[maxvol]

@googlebot I signed it!

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[ematejska]

The page now needs to take into consideration all platforms.

[dabrahams]

@compnerd PTAL. Should we change the prompt character from $ to >?

[compnerd]

I think that fixing the prompt character can be done in a follow up as it was incorrect before this.

[compnerd]

Thanks @maxvol for the improvements!