Updated QSql{Query,Result}::bindValue doc to reflect the current state.

Since 5.0 it is possible to use one call to bindValue to bind
values to multiple placeholders with the same name.

Task-number: QTBUG-23360
Change-Id: Ic838150d25dd07bca7bc9e5d91ab3362a73833d6
Reviewed-by: Matt Newell <newellm@blur.com>
Reviewed-by: Mark Brand <mabrand@mabrand.nl>

src/sql/kernel/qsqlquery.cpp

@@ -1063,12 +1063,6 @@ bool QSqlQuery::execBatch(BatchExecutionMode mode)
   To bind a NULL value, use a null QVariant; for example, use
   \c {QVariant(QVariant::String)} if you are binding a string.
 
-  Values cannot be bound to multiple locations in the query, eg:
-  \code
-  INSERT INTO testtable (id, name, samename) VALUES (:id, :name, :name)
-  \endcode
-  Binding to name will bind to the first :name, but not the second.
-
   \sa addBindValue(), prepare(), exec(), boundValue(), boundValues()
 */
 void QSqlQuery::bindValue(const QString& placeholder, const QVariant& val,

src/sql/kernel/qsqlresult.cpp

@@ -704,12 +704,6 @@ void QSqlResult::bindValue(int index, const QVariant& val, QSql::ParamType param
     Binds the value \a val of parameter type \a paramType to the \a
     placeholder name in the current record (row).
 
-   Values cannot be bound to multiple locations in the query, eg:
-   \code
-   INSERT INTO testtable (id, name, samename) VALUES (:id, :name, :name)
-   \endcode
-   Binding to name will bind to the first :name, but not the second.
-
     \note Binding an undefined placeholder will result in undefined behavior.
 
     \sa QSqlQuery::bindValue()