Fix doc errors.

Change-Id: I38d01d3b5d2b9b15edd389ea17142bd75f00e135
Reviewed-by: Geir Vattekar <geir.vattekar@nokia.com>

src/sql/kernel/qsqldriverplugin.cpp

@@ -78,7 +78,7 @@ QT_BEGIN_NAMESPACE
     key. The driver key is usually the class name of the required
     driver. Keys are case sensitive.
 
-    \sa keys()
+    \sa {How to Create Qt Plugins}
 */
 
 /*!

src/sql/kernel/qsqlerror.cpp

@@ -80,12 +80,6 @@ QDebug operator<<(QDebug dbg, const QSqlError &s)
     \value StatementError  SQL statement syntax error.
     \value TransactionError  Transaction failed error.
     \value UnknownError  Unknown error.
-
-    \omitvalue None
-    \omitvalue Connection
-    \omitvalue Statement
-    \omitvalue Transaction
-    \omitvalue Unknown
 */
 
 /*!

src/sql/kernel/qsqlresult.cpp

@@ -237,8 +237,6 @@ QString QSqlResultPrivate::namedToPositionalBinding()
 
     \value PositionalBinding Use the ODBC-style positional syntax, with "?" as placeholders.
     \value NamedBinding Use the Oracle-style syntax with named placeholders (e.g., ":id")
-    \omitvalue BindByPosition
-    \omitvalue BindByName
 
     \sa bindingSyntax()
 */

src/sql/models/qsqlrelationaltablemodel.cpp

@@ -675,8 +675,8 @@ void QSqlRelationalTableModel::clear()
 */
 
 /*!
-    Sets the SQL join mode to show or hide rows with NULL foreign keys.
-    In InnerJoin mode (the default) these rows will not be showed: use the
+    Sets the SQL \a joinMode to show or hide rows with NULL foreign keys.
+    In InnerJoin mode (the default) these rows will not be shown: use the
     LeftJoin mode if you want to show them.
 
     \sa QSqlRelationalTableModel::JoinMode