Browser: Update release notes for chrome not installed errors

[inancgumus]

What?

Updates v0.49.0 release notes for the PRs: grafana/xk6-browser#1137 and grafana/xk6-browser#1145.

Why?

Provides better error messages when Chromium/Chrome isn't found.

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

grafana/xk6-browser#1136

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (release-v0.49.0@37e10ba). Click here to learn what that means.

❗ Current head 183545d differs from pull request most recent head f8d4609. Consider uploading reports for the commit f8d4609 to get more accurate results

Additional details and impacted files

@@                Coverage Diff                 @@
##             release-v0.49.0    #3516   +/-   ##
==================================================
  Coverage                   ?   73.19%           
==================================================
  Files                      ?      267           
  Lines                      ?    20076           
  Branches                   ?        0           
==================================================
  Hits                       ?    14695           
  Misses                     ?     4467           
  Partials                   ?      914           

Flag	Coverage Δ
ubuntu	73.14% <0.00%> (?)
windows	73.04% <0.00%> (?)

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[ka3de]

LGTM.