Help: Fix typo that crashes older pygments lexers

In commit cb14ae2b87 (try_compile: Add SOURCE_FROM_{ARG,VAR},
2022-09-21, v3.25.0-rc1~94^2~2) we accidentally added unbalanced closing
`]` characters in the `try_compile` and `try_run` signatures.

Fixes: #24053
2 files changed