Doc: Fix typos and add missing words.

Change-Id: I40e4780bcabbca29425945a69d8a0781cd5c0e9f
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Fix compilation with older MinGW headers

Headers from mingw.org (4.7.2) declares _flushall only if __STRICT_ANSI__
is not defined ... Anyhow, we can as well use fflush(), which is in the
official standard.

Change-Id: Ic2b4d2ac724280f1304221be1fceab067af0c1f8
Reviewed-by: Samuel Gaist <samuel.gaist@edeltech.ch>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Documentation: Add '\since' to doc for Qt::Edge

That enum got introduced in b6e9a8f21ac8b4cc3cc56232ce346ebd7ba17a70

Change-Id: I2d69179624cecff63549bfee66bc68bb4b27af8c
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Network: Fix compiler warning about unused variable

Fix gcc 4.8 warning about unused variable in release mode.

Change-Id: Ie8ef4f99b4fbb9dbb47114fc37774373880fa21b
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>