Fixes for the spec and older version of jsDoc

[lrosenthol]

Description

Documentation Changes (doc/spec.adoc)

• Updated version number from 0.2.0 to 2.0.0
• Fixed typo: changed "implementors" to "implementers"
• Clarified notation section: changed "a search function" to "a search function calledeval"
• Removed unnecessary line breaks in several places to improve text flow

Changes to json-formula.js

1. Added dataTypes enum documentation
2. Added CustomFunctionDefinition typedef
3. Added globals typedef
4. Enhanced search() method documentation
5. Marked deprecated methods
6. Improved parameter descriptions
7. Removed obsolete documentation

Dependency Updates

• Upgraded jsdoc from version ^4.0.2 to ^4.0.5
• Updated related JSDoc dependencies in npm-shrinkwrap.json:
  • markdown-it from 12.3.2 to 14.1.0
  • markdown-it-anchor from ^8.4.1 to ^8.6.7
  • linkify-it from 3.0.3 to 5.0.0
  • mdurl from 1.0.1 to 2.0.0
  • uc.micro from 1.0.6 to 2.1.0
  • @types/markdown-it, @types/linkify-it, and @types/mdurl to newer versions
  • Added entities 4.5.0 and punycode.js 2.3.1

File Permissions

• Made makeDocs.sh executable

Generated Documentation

• Regenerated json-formula-specification-2.0.0-beta.1.html and .pdf with the updated content

• I have signed the CLA.

• I have written tests and verified that they fail without my change.

[lrosenthol]

@JohnBrinkman cherry picked the things he wanted from here. Closing