Update remove.rst

Add note about removing web/bundles/acmedemo directory
Update remove.rst
Update remove.rst
Applied comments
minor #4238 Finished #3924 (WouterJ)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #4238).

Discussion
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Finished #3924

Commits
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6f5c67c Applied comments
d16e21e Update remove.rst
ec568da Update remove.rst
6e72acc Update remove.rst