kconfig: Document SYMBOL_OPTIONAL logic
authorUlf Magnusson <ulfalizer@gmail.com>
Sun, 14 Jan 2018 09:56:20 +0000 (10:56 +0100)
committerChristian Lamparter <chunkeey@gmail.com>
Sun, 10 Feb 2019 20:54:34 +0000 (21:54 +0100)
Not obvious, especially if you don't already know how choices are
implemented.

No functional changes. Only comments added.

Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

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