add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/Documentation/ABI/README
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@@ -32,7 +32,7 @@
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 	layout of the files below for details on how to do this.)
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   obsolete/
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-  	This directory documents interfaces that are still remaining in
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+	This directory documents interfaces that are still remaining in
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 	the kernel, but are marked to be removed at some later point in
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 	time.  The description of the interface will document the reason
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 	why it is obsolete and when it can be expected to be removed.
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@@ -58,6 +58,14 @@
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 		be changed further.
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+Note:
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+   The fields should be use a simple notation, compatible with ReST markup.
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+   Also, the file **should not** have a top-level index, like::
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+
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+	===
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+	foo
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+	===
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+
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 How things move between levels:
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 Interfaces in stable may move to obsolete, as long as the proper