Doc: Fix "Missing '}'" warnings

The \e command cannot span multiple lines.

Task-number: QTBUG-29338
Change-Id: I98f690cf8c4f1aca2f26ea8a0541e21b2ebaa659
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
doc: Update information about qt.conf directories

Change-Id: Ia0ca9c58ca2232c9b8eec1aeb0012391004c12ca
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Doc: Fix broken links

Change-Id: I84a79c1c355e3ec969b52e3b964810e33fd6e206
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Doc: Corrected a typo and reworded a sentence

Change-Id: I8a4e37e4a7f9e371a81cfcda6e0ecd112821eaab
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>