fix typo in DESIGN.md doc
@@ -99,7 +99,7 @@ project and its various components.
* **Well-commented code**: Code should be commented and given Godocs, even
private methods and functions. It may *seem* obvious what they do at the
- time and why, but you might forget, and other will certainly come along.
+ time and why, but you might forget, and others will certainly come along.
* **Test Behaviors**: Test cases should be comprehensible as sets of
expected behaviors. Test cases read without code (e.g. just using `It`,
