document flag "disabled"

diff --git a/web/htdocs/help/edit/disabled.html b/web/htdocs/help/edit/disabled.html
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index 0000000..cabb1cc
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+++ b/web/htdocs/help/edit/disabled.html
@@ -0,0 +1,3 @@
+  <p>The target will not be tested automatically if set and is not zero.</p>
+
+  <p>This option is mainly for the administrator of IRSpy in case of trouble.</p>