Specify supported environment for Application Insights JS SDK

[pizzaz93]

Purpose

One item in microsoft/ApplicationInsights-JS#1792

Does this introduce a breaking change?

[ ] Yes
[X ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[X ] Documentation content changes
[ ] Other... Please describe:

[pizzaz93]

@jpiyali

[pizzaz93]

Since there hasn't been a response, closing.

[hectorhdzg]

@pizzaz93 looks like this sample app is quite old and using older version of Application Insights SDKs, please take a look at current version here

[pizzaz93]

Thank you @hectorhdzg, this PR was specific to a customer concern detailed in microsoft/ApplicationInsights-JS#1792, which was in regards to updating this sample app's code comment.