Update install.rst

[Ernestopheles]

Preventing issuing the false command for Update of catalyst through an explizit "Do NOT".

[coveralls]

Pull Request Test Coverage Report for Build 72

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at ?%

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Totals
Change from base Build 62:	0.0%
Covered Lines:
Relevant Lines:	0

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💛 - Coveralls

[Ernestopheles]

If you follow my drafts, then you just substitute the install.rst with my new page Installing Catalyst. Then forget about the changes I made on install.rst itself and delete this document.

[lenak25]

Thanks for the contribution @Ernestopheles .
We are closing this - per your latest comment - and will look at your recent pull requests.
Thanks,
Lena