Backport doc changes

[xtuc]

Q	A
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?
Deprecations?
Spec Compliancy?
Tests Added/Pass?
Fixed Tickets
License	MIT
Doc PR	yes
Dependency Changes

Includes changes from PR (also visible in commits):

• [doc] Fix: comments in usage w/ options #5400
• Improve options documentation for babel-plugin-transform-runtime #5401
• document cache option for babel-register #5440
• Update coffescript/register reference link address #5475
• Update babel-generator's README #5517
• Improve example of babel-plugin-transform-es2015-arrow-functions #5573
• Remove incorrect docs. #5580
• Update transform-es2015-modules-commonjs doc #5588

Specific changes from Babel 7 were excluded. Once this is merged I will push it on the website.

[mention-bot]

@xtuc, thanks for your PR! By analyzing the history of the files in this pull request, we identified @hzoo, @existentialism and @trodrigues to be potential reviewers.

[codecov]

Codecov Report

Merging #5613 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5613      +/-   ##
==========================================
+ Coverage   84.45%   84.48%   +0.03%     
==========================================
  Files         204      204              
  Lines        9600     9600              
  Branches     2697     2697              
==========================================
+ Hits         8108     8111       +3     
+ Misses       1005     1002       -3     
  Partials      487      487

Impacted Files	Coverage Δ
packages/babel-traverse/src/visitors.js	85.71% <0%> (-0.96%)	⬇️
...bel-plugin-transform-es2015-classes/src/vanilla.js	90.59% <0%> (+0.42%)	⬆️
packages/babel-traverse/src/path/context.js	86.2% <0%> (+0.86%)	⬆️
packages/babel-traverse/src/path/modification.js	74.75% <0%> (+0.97%)	⬆️
packages/babel-helper-call-delegate/src/index.js	68% <0%> (+4%)	⬆️

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[chicoxyzzy]

looks good to me