doc: tablename -> table (#10359)

vlib/orm/README.md

@@ -4,7 +4,7 @@
 
 ### Structs
 
-- `[tablename: 'name']` sets a custom table name
+- `[table: 'name']` sets a custom table name
 
 ### Fields
 
@@ -82,4 +82,4 @@ result := sql db {
 result := sql db {
     select from Foo where id > 1 order by id
 }
-```
+```