Fixed a typo

Author: rjrjr

docs/userguide/common-patterns.md

@@ -74,8 +74,6 @@ and add needless complexity.
 Besides the [skippable workflow](#skippable-workflows) pattern described above,
 another way a child can communicate to its parent that it has no work to do
 is with a nullable or otherwise un-renderable rendering type.
-(If you're using this patt
-and .
 
 Imagine a `PromptForPermissionMaybeWorkflow`, that renders a UI to get a passcode, but only if that permission has not already been granted. If you make its `RenderingT` nullable (e.g. `Screen?`), it can return `null` to indicate that its job is done. Its callers will be synchronously informed that the coast is clear, and can immediately render what they actually care about.