[DOC] Typo fix in NEWS.md

Fix https://github.com/ruby/ruby/pull/10366

NEWS.md

@@ -8,17 +8,16 @@ Note that each entry is kept to a minimum, see links for details.
 ## Language changes
 
 * String literals in files without a `frozen_string_literal` comment now behave
-  as if they were frozen. If they are mutated a deprecation warning is emited.
+  as if they were frozen. If they are mutated a deprecation warning is emitted.
   These warnings can be enabled with `-W:deprecated` or by setting `Warning[:deprecated] = true`.
-  To disable this change you can run Ruby with the `--disable-frozen-string-literal` command line
-  argument. [[Feature #20205]]
+  To disable this change, you can run Ruby with the `--disable-frozen-string-literal`
+  command line argument. [[Feature #20205]]
 
 * `it` is added to reference a block parameter. [[Feature #18980]]
 
 * Keyword splatting `nil` when calling methods is now supported.
-  `**nil` is treated similar to `**{}`, passing no keywords,
-  and not calling any conversion methods.
-  [[Bug #20064]]
+  `**nil` is treated similarly to `**{}`, passing no keywords,
+  and not calling any conversion methods.  [[Bug #20064]]
 
 * Block passing is no longer allowed in index.  [[Bug #19918]]