[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

docs/cover-in-ci.lst

@@ -1,4 +1,4 @@
 docs/lang/articles/basic
 docs/lang/articles/advanced
 docs/lang/articles/kernels
-docs/lang/articles/visualization/gui_system.md
+docs/lang/articles/visualization/gui_system.md