Use an even indent in NEWS for code

* Makes it easier to copy-paste and add code backticks.

NEWS

@@ -28,10 +28,10 @@ sufficient information, see the ChangeLog file or Redmine
     splat operator to avoid the warning and ensure correct behavior in
     Ruby 3.
 
-     def foo(key: 42); end; foo({key: 42})   # warned
-     def foo(**kw);    end; foo({key: 42})   # warned
-     def foo(key: 42); end; foo(**{key: 42}) # OK
-     def foo(**kw);    end; foo(**{key: 42}) # OK
+      def foo(key: 42); end; foo({key: 42})   # warned
+      def foo(**kw);    end; foo({key: 42})   # warned
+      def foo(key: 42); end; foo(**{key: 42}) # OK
+      def foo(**kw);    end; foo(**{key: 42}) # OK
 
   * When a method call passes keywords to a method that accepts keywords,
     but it does not pass enough required positional arguments, the
@@ -39,10 +39,10 @@ sufficient information, see the ChangeLog file or Redmine
     warning is emitted.  Pass the argument as a hash instead of keywords
     to avoid the warning and ensure correct behavior in Ruby 3.
 
-     def foo(h, **kw); end; foo(key: 42)      # warned
-     def foo(h, key: 42); end; foo(key: 42)   # warned
-     def foo(h, **kw); end; foo({key: 42})    # OK
-     def foo(h, key: 42); end; foo({key: 42}) # OK
+      def foo(h, **kw); end; foo(key: 42)      # warned
+      def foo(h, key: 42); end; foo(key: 42)   # warned
+      def foo(h, **kw); end; foo({key: 42})    # OK
+      def foo(h, key: 42); end; foo({key: 42}) # OK
 
   * When a method accepts specific keywords but not a keyword splat, and
     a hash or keywords splat is passed to the method that includes both
@@ -50,31 +50,31 @@ sufficient information, see the ChangeLog file or Redmine
     a warning will be emitted.  You will need to update the calling code
     to pass separate hashes to ensure correct behavior in Ruby 3.
 
-     def foo(h={}, key: 42); end; foo("key" => 43, key: 42)   # warned
-     def foo(h={}, key: 42); end; foo({"key" => 43, key: 42}) # warned
-     def foo(h={}, key: 42); end; foo({"key" => 43}, key: 42) # OK
-     def foo(h={}, key: 42); end; foo({"key" => 43}, key: 42) # OK
+      def foo(h={}, key: 42); end; foo("key" => 43, key: 42)   # warned
+      def foo(h={}, key: 42); end; foo({"key" => 43, key: 42}) # warned
+      def foo(h={}, key: 42); end; foo({"key" => 43}, key: 42) # OK
+      def foo(h={}, key: 42); end; foo({"key" => 43}, key: 42) # OK
 
   * If a method does not accept keywords, and is called with keywords,
     the keywords are still treated as a positional hash, with no warning.
     This behavior will continue to work in Ruby 3.
 
-     def foo(opt={});  end; foo( key: 42 )   # OK
+      def foo(opt={});  end; foo( key: 42 )   # OK
 
 * Non-symbols are allowed as a keyword argument keys if method accepts
   arbitrary keywords. [Feature #14183]
 
-   def foo(**kw); p kw; end; foo("str" => 1) #=> {"str"=>1}
+    def foo(**kw); p kw; end; foo("str" => 1) #=> {"str"=>1}
 
 * <code>**nil</code> is allowed in method definitions to explicitly mark
   that the method accepts no keywords. Calling such a method with keywords
   will result in an ArgumentError. [Feature #14183]
 
-   def foo(h, **nil); end; foo(key: 1)       # ArgumentError
-   def foo(h, **nil); end; foo(**{key: 1})   # ArgumentError
-   def foo(h, **nil); end; foo("str" => 1)   # ArgumentError
-   def foo(h, **nil); end; foo({key: 1})     # OK
-   def foo(h, **nil); end; foo({"str" => 1}) # OK
+    def foo(h, **nil); end; foo(key: 1)       # ArgumentError
+    def foo(h, **nil); end; foo(**{key: 1})   # ArgumentError
+    def foo(h, **nil); end; foo("str" => 1)   # ArgumentError
+    def foo(h, **nil); end; foo({key: 1})     # OK
+    def foo(h, **nil); end; foo({"str" => 1}) # OK
 
 * Passing an empty keyword splat to a method that does not accept keywords
   no longer passes an empty hash, unless the empty hash is necessary for