clarify text

rayfix · rayfix · commit ffb8257814fb · 2016-11-24T12:24:17.000-08:00
diff --git a/README.markdown b/README.markdown
@@ -897,7 +897,7 @@ if (name == "Hello") {
 }
 ```
 
-Parenthesis can make code read more clearly. While not strictly required for correctness by the compiler, including them is sometimes preferred.
+In larger expressions, optional parentheses can sometimes make code read more clearly.
 
 **Preferred:**
 ```swift

Original file line number	Diff line number	Diff line change
`@@ -897,7 +897,7 @@ if (name == "Hello") {`
`897`	`897`	`}`
`898`	`898`	```
`899`	`899`
`900`		`-Parenthesis can make code read more clearly. While not strictly required for correctness by the compiler, including them is sometimes preferred.`
	`900`	`+In larger expressions, optional parentheses can sometimes make code read more clearly.`
`901`	`901`
`902`	`902`	`Preferred:`
`903`	`903`	```swift