Fix tidy issue for rustdoc tests commands

Fix tidy issue for rustdoc tests commands · rust-lang/rust@4e258bb

Original file line number	Diff line number	Diff line change
`@@ -186,6 +186,11 @@ fn should_ignore(line: &str) -> bool {`
`186`	`186`	// - `//@[rev] normalize-stderr-test`
`187`	`187`	`\|\| static_regex!("\\s//@(\\[.\\]) (compile-flags\|normalize-stderr-test\|error-pattern).*")`
`188`	`188`	`.is_match(line)`
	`189`	`+// Matching for rustdoc tests commands.`
	`190`	+// It allows to prevent them emitting warnings like `line longer than 100 chars`.
	`191`	`+ \|\| static_regex!(`
	`192`	`+"\\s//@ \\!?(count\|files\|has\|has-dir\|hasraw\|matches\|matchesraw\|snapshot)\\s."`
	`193`	`+).is_match(line)`
`189`	`194`	`}`
`190`	`195`
`191`	`196`	/// Returns `true` if `line` is allowed to be longer than the normal limit.