Doc/SQL: update sql driver creation instructions

Fix the links, remove section about Q_ODBC_VERSION_2 - it wasn't there
since Qt5.0.

Change-Id: I571f5c2cf0f0e2df38638299c26814b510d1a8af
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

src/sql/doc/src/sql-driver.qdoc

@@ -171,7 +171,8 @@
     \section3 How to Build the QMYSQL Plugin on Windows
 
     You need to get the MySQL installation files (e.g.
-    \e{mysql-installer-web-community-8.0.18.0.msi}). Run the installer,
+    \l {https://dev.mysql.com/downloads/installer/}{mysql-installer-web-community-8.0.18.0.msi}).
+    Run the installer,
     select custom installation and install the MySQL C Connector
     which matches your Qt installation (x86 or x64).
     After installation make sure that the needed files are there:
@@ -192,9 +193,9 @@
 
     When you distribute your application, remember to include libmysql.dll
     in your installation package. It must be placed in the same folder
-    as the application executable. libmysql.dll additionally needs the
+    as the application executable. \e libmysql.dll additionally needs the
     MSVC runtime libraries which can be installed with vcredist.exe
-    (\l {https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads}(vcredist.exe)
+    (\l {https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads}{vcredist.exe}
 
     \target QOCI
     \section2 QOCI for the Oracle Call Interface (OCI)
@@ -356,10 +357,6 @@
     Windows NT based systems, this is the default. Note that the ODBC
     driver and the DBMS must also support Unicode.
 
-    Some driver managers and drivers do not support UNICODE. To use the
-    QODBC plugin with such drivers, it has to be compiled with
-    Q_ODBC_VERSION_2 defined.
-
     For the Oracle 9 ODBC driver (Windows), it is necessary to check
     "SQL_WCHAR support" in the ODBC driver manager otherwise Oracle
     will convert all Unicode strings to local 8-bit.