Fix some typos.

Change-Id: I3c3c96fbbc19e2a69ac2f22618f15f5262718e50
Reviewed-by: Laszlo Papp <lpapp@kde.org>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>

src/sql/kernel/qsqldatabase.cpp

@@ -433,7 +433,7 @@ void QSqlDatabasePrivate::disable()
     transactions. \note When using transactions, you must start the
     transaction before you create your query.
 
-    If an error occurrs, lastError() will return information about it.
+    If an error occurs, lastError() will return information about it.
 
     Get the names of the available SQL drivers with drivers().  Check
     for the presence of a particular driver with isDriverAvailable().

src/sql/kernel/qsqlquery.cpp

@@ -769,7 +769,7 @@ bool QSqlQuery::isValid() const
   Returns true if the query is \e{active}. An active QSqlQuery is one
   that has been \l{QSqlQuery::exec()} {exec()'d} successfully but not
   yet finished with.  When you are finished with an active query, you
-  can make make the query inactive by calling finish() or clear(), or
+  can make the query inactive by calling finish() or clear(), or
   you can delete the QSqlQuery instance.
 
   \note Of particular interest is an active query that is a \c{SELECT}

src/widgets/dialogs/qmessagebox.cpp

@@ -688,7 +688,7 @@ void QMessageBoxPrivate::_q_buttonClicked(QAbstractButton *button)
     defined \l ButtonRole.
 
     \value Ok An "OK" button defined with the \l AcceptRole.
-    \value Open A "Open" button defined with the \l AcceptRole.
+    \value Open An "Open" button defined with the \l AcceptRole.
     \value Save A "Save" button defined with the \l AcceptRole.
     \value Cancel A "Cancel" button defined with the \l RejectRole.
     \value Close A "Close" button defined with the \l RejectRole.

src/widgets/widgets/qdialogbuttonbox.cpp

@@ -817,7 +817,7 @@ QDialogButtonBox::~QDialogButtonBox()
     defined \l ButtonRole.
 
     \value Ok An "OK" button defined with the \l AcceptRole.
-    \value Open A "Open" button defined with the \l AcceptRole.
+    \value Open An "Open" button defined with the \l AcceptRole.
     \value Save A "Save" button defined with the \l AcceptRole.
     \value Cancel A "Cancel" button defined with the \l RejectRole.
     \value Close A "Close" button defined with the \l RejectRole.