Correct grammar in DropShadow's detailed description.

Change-Id: If77e25a80ed139c0903b511062ff6dd615df2c70
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Doc: Applied title case in section1 titles

Task-number: QTBUG-41250
Change-Id: Ic91b1db2bd27800a808cd4c997c1b606ea4bec10
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Merge remote-tracking branch 'origin/5.4' into dev

Change-Id: I56d3c01f3ceffc318085a3cef8bd6cfe152f141e