Doc: rewrite descriptions of opening links in split windows
Doc: rewrite descriptions of opening links in split windows

Fixed two typos and used more consistent style with the rest
of the manual. Please ask me or some other tech writer to
review when you add text :).

Change-Id: I53fbd7268a82724e3ca862e7d6fcadb97899e478
Reviewed-by: David Schulz <f07954e8cc0c222cd136162588d217f330598215@digia.com>

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