Clarify bug fix description in 2.5.5 post (en)

Author: stomar

en/news/_posts/2019-03-15-ruby-2-5-5-released.md

@@ -9,9 +9,9 @@ lang: en
 
 Ruby 2.5.5 has been released.
 
-This release includes a bug fix for a deadlock in multi-thread/multi-process (using `Process.fork`) applications, like for example Puma.
+This release includes a bug fix for a deadlock in multi-thread/multi-process applications (that use `Process.fork` from multi-threaded parent processes), like for example Puma.
 
-See the [commit logs](https://github.com/ruby/ruby/compare/v2_5_4...v2_5_5) for changes in details.
+See the [commit logs](https://github.com/ruby/ruby/compare/v2_5_4...v2_5_5) for changes in detail.
 
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