[Issue 17998] Document Options for install.sh

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17998

Iain Buclaw <ibuclaw at gdcproject.org> changed:

           What    |Removed                     |Added
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--- Comment #3 from Iain Buclaw <ibuclaw at gdcproject.org> ---
*** Issue 19815 has been marked as a duplicate of this issue. ***

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