Correct typo in rules documentation (#8303)

## Summary

Add missing "is":
```diff
- The 🧪 emoji indicates that a rule in "preview".
+ The 🧪 emoji indicates that a rule is in "preview".
```

## Test Plan

N/A
This commit is contained in:
Harmon 2023-10-28 06:14:13 -05:00 committed by GitHub
parent 7b4b004506
commit 223873c8c7
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@ -64,7 +64,7 @@ pub(crate) fn generate() -> String {
table_out.push('\n');
table_out.push_str(&format!(
"The {PREVIEW_SYMBOL} emoji indicates that a rule in [\"preview\"](faq.md#what-is-preview)."
"The {PREVIEW_SYMBOL} emoji indicates that a rule is in [\"preview\"](faq.md#what-is-preview)."
));
table_out.push('\n');
table_out.push('\n');