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Document the new `retain` class with its configuration variables in the variable index. (From yocto-docs rev: b62f1be5dada0fb760ff7e0806b16225f7261560) Signed-off-by: Antonin Godard <antonin.godard@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>