Rewrite Install Wizard section

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	admin_manual/installation/installation_source.rst
Fix several formatting issues

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	admin_manual/installation/installation_source.rst
Small format fix, improve instruction order in apache section

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	admin_manual/installation/installation_source.rst
A few more formatting corrections and clarification

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	admin_manual/installation/installation_source.rst
Naming correction
minor fixes

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	admin_manual/installation/installation_source.rst
Remove superfluous sentence