Manual.rst: enhance debug tipps.

extension/Documentation/Manual.rst

@@ -6251,11 +6251,13 @@ QFQ specific
 Variable empty: {{...}}
 ^^^^^^^^^^^^^^^^^^^^^^^
 
-Specify the required sanitize class. Remember: for STORE_FORM and STORE_CLIENT the default is `digit`. This means if
+Specify the required sanitize class. Remember: for STORE_FORM and STORE_CLIENT the default is sanatize class is `digit`. This means if
 the variable content is a string, this violates the sanitize class and the replaced content will be an empty string!
 
 Form: put the problematic variable or SQL statement in the 'title' or note 'field' of a `FormElement`. This should show
-the content. For SQL statements insert a character before the SQL Keyword to avoid SQL triggering.
+the content. For SQL statements, remove the outer token (e.g. only one curly brace) to avoid SQL triggering: ::
+
+  Person { SELECT ... WHERE id={{buggyVar:alnumx}} }
 
 Error read file config.qfq.ini: syntax error on line xx
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -6268,10 +6270,10 @@ Logging
 General webserver error log
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-For apache: /var/log/apache2/error_log
+For apache: `/var/log/apache2/error_log`
 
 Especially if you got a blank page (no rendering at all), this is typically an uncaught PHP error. Check the error message
-and report the bug.
+and report the bug (http://qfq.io > Contact).
 
 Call to undefined function qfq\\mb_internal_encoding()
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