clamp: Fix using "width" instead of "size" in doc

12 jobs for clamp in 18 minutes and 44 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Build
passed #1341854
abi-check

00:06:18

passed #1341850
api-visibility

00:00:48

passed #1341852
build-debian-clang

00:03:28

passed #1341851
build-debian-gcc

00:03:06

passed #1341853
build-fedora-gcc

00:04:50

passed #1341855
flatpak
build-flatpak

00:02:05

passed #1341856
flatpak
build-flatpak-glade

00:04:16

 
  Test+Docs
passed #1341857
build-gtkdoc

00:03:17

passed #1341858
unit-test

00:02:42

47.8%
 
  Package
passed #1341859
package-debian-buster

00:06:32

 
  Test Package
passed #1341860
autopkgtest-debian-buster-package

00:01:41

passed #1341861
lintian-debian-buster-package

00:02:34