docs/83693: [PATCH] Remove <note> tags in Install chapter

[Siebrand Mazeland]

Please close and ignore this report. I submitted this patch before building
it and finding out I was tricked into trying to fix a (obviously completely
valid) hack :(. The patch results in a 'document type does not allow element
"TITLE" here;' and that does not seem like a proper solution. I'll try and
come up with a more elegant solution.

Note to self: mind those little hacks in the documentation to make it work!

Cheers!

Siebrand