Update autocompletion doc

[mgrybyk]

Proposed changes

Update autocompletion doc https://webdriver.io/docs/autocompletion.html

• removed obsolete/outdated steps (from my point of view)
• added guide on how to enable autocompletion in VSCode with JavaScript

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

Reviewers: @webdriverio/technical-committee

[christian-bromann]

👍

[codecov]

Codecov Report

Merging #4729 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4729   +/-   ##
=======================================
  Coverage   99.39%   99.39%           
=======================================
  Files         207      207           
  Lines        5306     5306           
  Branches     1145     1146    +1     
=======================================
  Hits         5274     5274           
  Misses         29       29           
  Partials        3        3

Impacted Files	Coverage Δ
packages/webdriver/src/utils.js	100% <0%> (ø)	⬆️

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[christian-bromann]

👍