And remove inelegant "an" wording.

Fixes:
$ apk add -i sane-backends
ERROR: unsatisfiable constraints:
  so:libnetsnmp.so.30 (missing):
    required by: sane-backend-magicolor-1.0.27-r1[so:libnetsnmp.so.30]
---
 testing/sane/APKBUILD | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/testing/sane/APKBUILD b/testing/sane/APKBUILD
index 1e8be39064..4a77e35ffe 100644
--- a/testing/sane/APKBUILD
+++ b/testing/sane/APKBUILD
@@ -4,8 +4,8 @@
 pkgname=sane
 _pkgname=sane-backends
 pkgver=1.0.27
-pkgrel=1
-pkgdesc="Scanner Access Now Easy - an universal scanner interface"
+pkgrel=2
+pkgdesc="Scanner Access Now Easy - universal scanner interface"
 url="http://www.sane-project.org/"
 arch="x86 x86_64 aarch64 armv7 armhf"
 license="GPL-2.0-or-later GPL-2.0-or-later-with-sane-exception Public-Domain"
-- 
2.20.1



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