User manual: Add space after punctuation

Signed-off-by: Tim Wootton <tim@tee-jay.demon.co.uk>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
User manual: shortcut keys also depend on language

Notes dependancy of shortcut keys on language as well as OS.
Writes Operating System in full not abbr.
More fully describes how to spot a shortcut key in the menu

Signed-off-by: Tim Wootton <tim@tee-jay.demon.co.uk>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
User manual: sync divenotes & equipment sections

Brings the changes that were made to Dive Notes and Equipment
under the Manual Entry section into the Imported from DC section
was well, while preserving the imported from DC specific stuff.

Signed-off-by: Tim Wootton <tim@tee-jay.demon.co.uk>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>