frozen_string_literal magic comment is inserted into Overview

[ybiquitous]

While reading the JSON module documentation on https://www.rubydoc.info/gems/json/2.5.1/JSON, I noticed that the Overview section was incorrect. The section includes only the frozen_string_literal: false magic comment.

Here is the source code of lib/json.rb:
https://github.com/flori/json/blob/v2.5.1/lib/json.rb

#frozen_string_literal: false
require 'json/common'

##
# = JavaScript \Object Notation (\JSON)
#
# \JSON is a lightweight data-interchange format.
...

Steps to reproduce

This is the minimal reproduction for the issue. I've done my best to remove
all extraneous code and unique environment state on my machine before providing
these steps:

1. Run git clone https://github.com/flori/json.git
2. Run cd json
3. Run git checkout v2.5.1
4. Run yard
5. Run open doc/JSON.html

Actual Output

Expected Output

NOTE: The screenshot above can be obtained when I removed all the frozen_string_literal comments.
(via sed -i '' -e '/frozen_string_literal/d' $(git ls-files lib))

Environment details:

• OS: macOS Catalina version 10.15.7
• Ruby version (ruby -v): ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin19]
• YARD version (yard -v): yard 0.9.25
• Relevant software dependency/versions:
  • json 2.5.1 (https://rubygems.org/gems/json)

I have read the Contributing Guide.

[ybiquitous]

@lsegal Thank you for the quick fix! 😄