Fix typo

docs/api/CONTRIBUTING.md

@@ -2,6 +2,6 @@ Contributing to the documentation
 =================================
 
 - To link to the page for `ClassName`, use `[page:ClassName link title]` (or just `[page:ClassName]`). Use `[page:ClassName.memberName]` to link to a class member (a property or method) called `memberName` on the page for `ClassName`. You can write `[page:.memberName]` to link to a property or method called `memberName` on the same page.
-- Use `[example:exampleName title]` (ot just `[example:exampleName]`) to link to the example `threejs.org/examples/#exampleName`.
+- Use `[example:exampleName title]` (not just `[example:exampleName]`) to link to the example `threejs.org/examples/#exampleName`.
 - Document a property by writing `<h3>[property:TypeName propertyName]</h3>`.
-- Document a method using `<h3>[method:ReturnType methodName]</h3>`.
+- Document a method using `<h3>[method:ReturnType methodName]</h3>`.