NEWS: [DOC] markup hyphens [ci skip]

* NEWS: [DOC] markup command line options, not to convert
  successive hyphens to an en-dash unintentionally.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67478 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

NEWS

@@ -94,9 +94,9 @@ profile.rb, Profiler__::
 
 JIT::
 
-  * Default value of --jit-max-cache is changed from 1,000 to 100
+  * Default value of +--jit-max-cache+ is changed from 1,000 to 100
 
-  * Default value of --jit-min-calls is changed from 5 to 10,000
+  * Default value of +--jit-min-calls+ is changed from 5 to 10,000
 
 === Miscellaneous changes