doc: Give example of when to use describe in .guix-channel file.
* doc/guix.texi (Package Modules in a Sub-directory): Mention "guix deploy" files as an example. Signed-off-by: Ricardo Wurmus <rekado@elephly.net>
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					@ -5620,6 +5620,12 @@ The modules must be @b{underneath} the specified directory, as the
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defined as @code{(define-module (gnu packages fun))} must be located at
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					defined as @code{(define-module (gnu packages fun))} must be located at
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@code{base/gnu/packages/fun.scm}.
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					@code{base/gnu/packages/fun.scm}.
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					Doing this allows for only parts of a repository to be used as a
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					channel, as Guix expects valid Guile modules when pulling.  For
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					instance, @command{guix deploy} machine configuration files are not
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					valid Guile modules, and treating them as such would make @command{guix
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					pull} fail.
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@node Declaring Channel Dependencies
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					@node Declaring Channel Dependencies
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@section Declaring Channel Dependencies
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					@section Declaring Channel Dependencies
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