fixed typo (#6694)

found a small typo and fixed it.

website/docs/reference/feature-flag-naming-patterns.mdx

@@ -16,7 +16,7 @@ Patterns are implicitly anchored to the start and end of the string. This means
 
 Feature flag naming patterns are defined on a per-project basis.
 
-In addition to the pattern itself, you can also define a an example and a description of the pattern. If defined, both the example and the description will be shown to the user when they are creating a new feature flag.
+In addition to the pattern itself, you can also define an example and a description of the pattern. If defined, both the example and the description will be shown to the user when they are creating a new feature flag.
 
 ## Overview