Use multiline string literals in examples

Author: beccadax

stdlib/public/core/CompilerProtocols.swift

@@ -773,8 +773,10 @@ extension ExpressibleByStringInterpolation
   ///
   ///     let price = 2
   ///     let number = 3
-  ///     let message = "If one cookie costs \(price) dollars, " +
-  ///                   "\(number) cookies cost \(price * number) dollars."
+  ///     let message = """
+  ///                   If one cookie costs \(price) dollars, \
+  ///                   \(number) cookies cost \(price * number) dollars.
+  ///                   """
   ///     print(message)
   ///     // Prints "If one cookie costs 2 dollars, 3 cookies cost 6 dollars."
   public init(stringInterpolation: DefaultStringInterpolation) {

stdlib/public/core/StringInterpolation.swift

@@ -20,8 +20,10 @@
 ///
 ///     let price = 2
 ///     let number = 3
-///     let message = "If one cookie costs \(price) dollars, " +
-///                   "\(number) cookies cost \(price * number) dollars."
+///     let message = """
+///                   If one cookie costs \(price) dollars, \
+///                   \(number) cookies cost \(price * number) dollars.
+///                   """
 ///     print(message)
 ///     // Prints "If one cookie costs 2 dollars, 3 cookies cost 6 dollars."
 /// 
@@ -96,8 +98,10 @@ public struct DefaultStringInterpolation: StringInterpolationProtocol {
   ///
   ///     let price = 2
   ///     let number = 3
-  ///     let message = "If one cookie costs \(price) dollars, " +
-  ///                   "\(number) cookies cost \(price * number) dollars."
+  ///     let message = """
+  ///                   If one cookie costs \(price) dollars, \
+  ///                   \(number) cookies cost \(price * number) dollars.
+  ///                   """
   ///     print(message)
   ///     // Prints "If one cookie costs 2 dollars, 3 cookies cost 6 dollars."
   @inlinable
@@ -136,8 +140,10 @@ public struct DefaultStringInterpolation: StringInterpolationProtocol {
   ///
   ///     let price = 2
   ///     let number = 3
-  ///     let message = "If one cookie costs \(price) dollars, " +
-  ///                   "\(number) cookies cost \(price * number) dollars."
+  ///     let message = """
+  ///                   If one cookie costs \(price) dollars, \
+  ///                   \(number) cookies cost \(price * number) dollars.
+  ///                   """
   ///     print(message)
   ///     // Prints "If one cookie costs 2 dollars, 3 cookies cost 6 dollars."
   @inlinable
@@ -156,8 +162,10 @@ public struct DefaultStringInterpolation: StringInterpolationProtocol {
   ///
   ///     let price = 2
   ///     let number = 3
-  ///     let message = "If one cookie costs \(price) dollars, " +
-  ///                   "\(number) cookies cost \(price * number) dollars."
+  ///     let message = """
+  ///                   If one cookie costs \(price) dollars, \
+  ///                   \(number) cookies cost \(price * number) dollars.
+  ///                   """
   ///     print(message)
   ///     // Prints "If one cookie costs 2 dollars, 3 cookies cost 6 dollars."
   @inlinable
@@ -193,8 +201,10 @@ extension String {
   ///
   ///     let price = 2
   ///     let number = 3
-  ///     let message = "If one cookie costs \(price) dollars, " +
-  ///                   "\(number) cookies cost \(price * number) dollars."
+  ///     let message = """
+  ///                   If one cookie costs \(price) dollars, \
+  ///                   \(number) cookies cost \(price * number) dollars.
+  ///                   """
   ///     print(message)
   ///     // Prints "If one cookie costs 2 dollars, 3 cookies cost 6 dollars."
   @inlinable
@@ -215,8 +225,10 @@ extension Substring {
   ///
   ///     let price = 2
   ///     let number = 3
-  ///     let message = "If one cookie costs \(price) dollars, " +
-  ///                   "\(number) cookies cost \(price * number) dollars."
+  ///     let message = """
+  ///                   If one cookie costs \(price) dollars, \
+  ///                   \(number) cookies cost \(price * number) dollars.
+  ///                   """
   ///     print(message)
   ///     // Prints "If one cookie costs 2 dollars, 3 cookies cost 6 dollars."
   @inlinable