Update language in examples.md to refer to 'Get Command'

[arouinfar]

In https://github.com/phetsims/studio/issues/298 we updated the get/set interface in Studio. The examples doc references the "Copy Set Value Code" button which no longer exists, so we should update it.

[arouinfar]

Updated in the above commits. The changes happened in the same paragraph as the additions made in #971. However, I made sure not to change any of the text that was added in #971.

[arouinfar]

@samreid @matthew-blackman please review, if all looks good, this is ready for cherry-picking.

[samreid]

Tagging for https://github.com/phetsims/qa/issues/908 in case we use that as the list to cherry-pick.

[samreid]

The updates look reasonable to me, thanks!

[matthew-blackman]

Looks great @arouinfar

[samreid]

For QA, please check that examples.md has text like "The Get Command button will populate the text box ". One platform only.

[Nancy-Salpepi]

I'm confused about this one @samreid . In rc.3 the button in Studio still says 'Copy Set Value Code.'

[Nancy-Salpepi]

The Examples doc has been updated with 'Get Command.'

[Nancy-Salpepi]

In rc.4 the Examples doc has been updated with 'Get Command' and I think the directions are clear on to how to use this button. Closing.