F8806 Implement SQL Stored Procedure 'qnl2br()'. Update doc

Documentation/Manual.rst

@@ -6699,6 +6699,20 @@ Example::
 In case 'Note.title' contains a '|' (like 'fruit | numbers'), it will confuse the '... AS _link' class. Therefore it's
 necessary to 'escape' (adding a '\' in front of the problematic character) the bar which is done by using `QBAR()`.
 
+.. _qnl2br:
+
+QNL2BR: Convert newline to HTML '<br>'
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The SQL function QNL2BR(text) replaces `LF` or `CR/LF` by `<br>`. This can be used for data (containing LF) to output
+on a HTML page with correctly displayed linefeed.
+
+Example::
+
+    10.sql = SELECT QNL2BR(Note.title) FROM Note  
+
+One possibility how `LF` comes into the database is with form elements of type `textarea` if the user presses `enter` inside.
+
 .. _qmore-truncate-long-text:
 
 QMORE: Truncate Long Text - more/less