Added formatting for a list of reading methods.

Added link to table with types that QDataStream can serialize

Removed unnecessary \l statements

Shortened length file io section

It now only describes the general use of the functions

Edited section on file i/o

Removed commented section

Minor punctuation corrections

Removed trailing whitespace

Minor corrections as suggested by reviewer

Change-Id: I847c468c7c6be2c6bfedb7f22736bd5e17338eda
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>