Fixed the wrong indentation due to the GitHub editor

Author: pitiphong-p

stdlib/public/Darwin/Foundation/PlistEncoder.swift

@@ -266,9 +266,9 @@ fileprivate struct _PlistKeyedEncodingContainer<K : CodingKey> : KeyedEncodingCo
 
     public mutating func nestedContainer<NestedKey>(keyedBy keyType: NestedKey.Type, forKey key: Key) -> KeyedEncodingContainer<NestedKey> {
         let containerKey = key.stringValue
-	let existingContainer = self.container[containerKey]
+        let existingContainer = self.container[containerKey]
         precondition(existingContainer is NSMutableDictionary?,
-            "Attempt to request for keyed container with the key that previously unkeyed container already requested.")
+                     "Attempt to request for keyed container with the key that previously unkeyed container already requested.")
         let dictionary = existingContainer as? NSMutableDictionary ?? NSMutableDictionary()
         self.container[containerKey] = dictionary
 
@@ -283,7 +283,7 @@ fileprivate struct _PlistKeyedEncodingContainer<K : CodingKey> : KeyedEncodingCo
         let containerKey = key.stringValue
         let existingContainer = self.container[containerKey]
         precondition(existingContainer is NSMutableArray?,
-	    "Attempt to request for unkeyed container with the key that previously keyed container already requested.")
+	                 "Attempt to request for unkeyed container with the key that previously keyed container already requested.")
         let array = existingContainer as? NSMutableArray ?? NSMutableArray()
         self.container[containerKey] = array