update help page for Edit - Links to External Files

- updated "generic" explanation used by all modules with "links_text"
variable.
This explanation is now embedded in the overview of the Edit menu
help page for all modules.
- added module switch (after generic explanation), to indicate which
specific kinds of links can be edited. (Kudos to Mike Kaganski
for essential help)
- change label: Links --> Links to External Files
- also in access command in edit_menu
- reorganize controls to correspond to dialog order
- move paragraph about double-click to under "Source" heading
- move <notes> to end of page -- they are not directly relevant
to the command, but the information is generally relevant to those
who would use this command, and not found currently elsewhere.
- remove sys-specific warning about local cache (thanks again Mike)
- add embed about "Close" command
- removed "verknuepfungentext" variable and updated sdraw to use
"links_text" like other modules (this was only place where
that variable was used).
- update to: <h1>,<h2>,<warning>,<note>
- add some <keycode> to edit_menu

Change-Id: Idea3c38569f139a8d2e51de3c75a238c5fc35cf8
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/104677
Tested-by: Jenkins
Reviewed-by: Seth Chaiklin <sdc.blanco@youmail.dk>

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