doc: Fix syntax error and remove trailing whitespace.

This is a follow-up to commit a33652ee336ae9a5d2ab5fd54bf2397caec42a0e.

* doc/guix.texi (Prometheus Node Exporter Service): Remove trailing whitespace
and change "defvr" to "defvar".

1 files changed, 3 insertions, 3 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 3f0eedd0d9..5ab609c730 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -15654,11 +15654,11 @@ Specify the path of the base URL.  This can be useful if
 
 @cindex prometheus-node-exporter
 The Prometheus ``node exporter'' makes hardware and operating system statistics
-provided by the Linux kernel available for the Prometheus monitoring system. 
+provided by the Linux kernel available for the Prometheus monitoring system.
 This service should be deployed on all physical nodes and virtual machines,
-where monitoring these statistics is desirable. 
+where monitoring these statistics is desirable.
 
-@defvr {Scheme variable} prometheus-node-exporter-service-type
+@defvar {Scheme variable} prometheus-node-exporter-service-type
 This is the service type for the
 @uref{https://github.com/prometheus/node_exporter/, prometheus-node-exporter}
 service, its value must be a @code{prometheus-node-exporter-configuration}