Add documentation about editor modes in features page

Codemirror provides various modes via keymapping. These are already
available by a menu in the interface. But they aren't mentioned
anywhere.

This patch provides some documentation about the editor modes and their
implications. Since they are a feature, the documentation is done on the
features page.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

0 files changed, 0 insertions, 0 deletions