Adjust wording

Author: amartini51

TSPL.docc/LanguageGuide/Enumerations.md

@@ -479,10 +479,12 @@ case let .qrCode(productCode):
   ```
 -->
 
-When you're matching just one case of an enumeration,
-you can use the shorter `if case` syntax
+When you're matching just one case of an enumeration ---
+for example,
+to extract its associated value ---
+there's a shorter syntax you can use
 instead of writing a full switch statement.
-For example:
+Here's what it looks like:
 
 ```swift
 if case .qrCode(let productCode) = productBarcode {
@@ -494,8 +496,10 @@ In this code,
 the condition for the `if` statement starts with `case`,
 indicating that the condition is a pattern instead of a Boolean value.
 If the pattern matches,
-the condition for the `if` is considered to be true;
-otherwise it's false.
+the condition for the `if` is considered to be true,
+and the code in the body of the `if` statement runs.
+The patterns you can write after `if case`
+are the same as the patterns you can write in a switch case.
 Just like in the switch statement earlier,
 the `productBarcode` variable is matched against
 the pattern `.qrCode(let productCode)` here.