Update doc/contributing/large-pull-requests.md

Co-authored-by: Joyee Cheung <joyeec9h3@gmail.com>

Author: mcollina

doc/contributing/large-pull-requests.md

@@ -113,7 +113,7 @@ When a large pull request adds or modifies a dependency in `deps/`:
 ## Avoiding large pull requests
 
 Contributors should always consider whether a large pull request can be split
-into smaller, independently reviewable pieces. Strategies include:
+into smaller, independently reviewable pull requests. Strategies include:
 
 * Landing foundational internal APIs first, then building on top of them.
 * Landing refactoring or preparatory changes before the main feature.