Update blog/temporal-release/index.md

Co-authored-by: José Julián Espina <[email protected]>

Author: nekevss

blog/temporal-release/index.md

@@ -79,7 +79,7 @@ let date = Date::new_with_overflow(
 ).unwrap();
 ```
 
-Luckily, custom calendar and time zone were removed from the
+Luckily, custom calendars and time zones were removed from the
 specification in the first half of 2024, so `temporal_rs` was able to
 remove that support, which greatly benefitted the entire API. For
 instance, here's the same code in the 0.1 version of `temporal_rs`: