Few doc tweaks:

README.md

@@ -121,7 +121,7 @@ To combine JSON fragments into a bigger JSON document, you can use `JSON::Fragme
 posts_json = cache.fetch_multi(post_ids) do |post_id|
   JSON.generate(Post.find(post_id))
 end
-posts_json.map { |post_json| JSON::Fragment.new(post_json) }
+posts_json.map! { |post_json| JSON::Fragment.new(post_json) }
 JSON.generate({ posts: posts_json, count: posts_json.count })
 ```
 

json.gemspec

@@ -52,7 +52,7 @@ spec = Gem::Specification.new do |s|
     s.files += Dir["lib/json/ext/**/*.jar"]
   else
     s.extensions = Dir["ext/json/**/extconf.rb"]
-    s.files += Dir["ext/json/**/*.{c,h,rl}"]
+    s.files += Dir["ext/json/**/*.{c,h}"]
   end
 end
 

lib/json/common.rb

@@ -172,10 +172,10 @@ class MissingUnicodeSupport < JSONError; end
   #   JSON.generate({ count: 3, items: fragments })
   #
   # This allows to easily assemble multiple JSON fragments that have
-  # been peristed somewhere without having to parse them nor resorting
+  # been persisted somewhere without having to parse them nor resorting
   # to string interpolation.
   #
-  # Note: no validation is performed on the provided string. it is the
+  # Note: no validation is performed on the provided string. It is the
   # responsability of the caller to ensure the string contains valid JSON.
   Fragment = Struct.new(:json) do
     def initialize(json)