Re-added note about R-trees in PostgreSQL (noting MySQL 4.1 support too).

Docs/manual.texi

@@ -4968,6 +4968,10 @@ Standard usage in PostgreSQL is closer to ANSI SQL in some cases.
 @item
 One can speed up PostgreSQL by coding things as stored procedures.
 
+@item
+For geographical data, R-trees make PostgreSQL better than MySQL Server.
+(note: MySQL version 4.1 will have R-trees for MyISAM tables).
+
 @item
 The PostgreSQL optimiser can do some optimisation that the current MySQL
 optimiser can't do.  Most notable is doing joins when you don't have the