doc: Use @defvar instead of @defvr for Scheme variables.

* doc/guix.texi (Build Systems) (Search Paths) (The Store)
(The Store Monad) (File Systems) (Mapped Devices) (User Accounts)
(Locales) (Base Services) (Scheduled Job Execution) (Log Rotation)
(Networking Setup) (Networking Services) (Unattended Upgrades)
(X Window) (Desktop Services) (Database Services) (Messaging Services)
(Kerberos Services) (Web Services) (Certificate Services) (VPN Services)
(Network File System) (Samba Services) (Power Management Services)
(Audio Services) (Virtualization Services) (Linux Services) (Hurd Services)
(Miscellaneous Services) (Setuid Programs) (Name Service Switch)
(Initial RAM Disk) (Service Reference) (Shepherd Services)
(Essential Home Services) (Mcron Home Service)
(Power Management Home Services) (Shepherd Home Service) (Secure Shell)
(Desktop Home Services) (Guix Home Services) (Supported Platforms)
(Instantiate an Image) (image-type Reference): Use @defvar instead of @defvr for Scheme variables.

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

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