Wrong function comment for `UpdateGlobal`
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good first issue
severity/minor
sig/sql-infra
type/bug
- Dominant language
- Go
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Description
## Bug Report
https://github.com/pingcap/tidb/blob/1c6c5ad2acd6d5d2d4eee9b80032181a8f936a65/pkg/config/config.go#L1396-L1402
There's no "restore function" returned by `UpdateGlobal`. The comment should be updated, or code should be aligned with comment.
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