doc: Use @defun for procedures.

* doc/guix.texi (Inferiors, Defining Packages, package Reference)
(origin Reference, Defining Package Variants, Writing Manifests)
(Build Utilities, Search Paths, The Store, Derivations, The Store Monad)
(G-Expressions, File Systems, Keyboard Layout, Base Services, X Window)
(Desktop Services, File-Sharing Services, Web Services, Virtualization Services)
(Version Control Services, Miscellaneous Services, Initial RAM Disk)
(Bootloader Configuration, Service Reference, Shepherd Services)
(Complex Configurations): Use @defun for procedures.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

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