Fix typo: threfore -> therefore

Closes GNOME/glib#1961
17 jobs for master in 50 minutes and 56 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Style Check
passed #527898
style-check-diff

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  Build
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cross-android_api21_arm64

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passed #527904
cross-android_api28_arm64

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passed #527905
cross-mingw64

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passed #527900
debian-stable-x86_64

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passed #527899
fedora-x86_64

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passed #527902
G_DISABLE_ASSERT

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passed #529356
installed-tests

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passed #527906
win32
msys2-mingw32

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passed #527907
win32
vs2017-x64

00:08:08

failed #528917
installed-tests

00:15:28

failed #527901
installed-tests

01:25:36

 
  Coverage
passed #527908
coverage

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78.0%
 
  Analysis
passed #527910
scan-build

00:08:25

failed #527909
allowed to fail
valgrind

00:02:48

 
  Deploy
passed #527911
pages

00:01:03

passed pages:deploy

00:00:03

 
Name Stage Failure
failed
valgrind Analysis
Uploading artifacts...
_build/config.h: found 1 matching files
_build/glib/glibconfig.h: found 1 matching files

_build/meson-logs: found 5 matching files

Uploading artifacts to coordinator... ok
id=527909 responseStatus=201 Created token=coq4xsHv
Uploading artifacts...
WARNING: _build/valgrind-report.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit code 1