Updating misleading build target documentation

[RicardoVaranda]

The old build documentation stated that prod was a valid target command which is incorrect.

The working and valid production commands are:

--prod
-prod

Not:
prod

[tcoz]

From the docs it seems there's all these options:

ng build --prod
(seems preferred)

ng build -prod
(works, albeit frowned upon)

ng build --target -prod
(what this doc says)

If that's correct, maybe that could be made clearer elsewhere, otherwise this fixes the --target arg doc.

[RicardoVaranda]

@tcoz Thank you for your fast reply and feedback, I've made some changes to further clarify this hopefully this makes it more clear.

[tcoz]

LGTM.

[hansl]

LGTM. Thanks!

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