The following commentary comes from an independent investor or market observer as part of TheStreet's guest contributor program, which is separate from the company's news coverage.NEW YORK ( TheStreet) -- Not too long ago, Apple ( AAPL) was riding high at about $644 a share. Today, it's $578, and under pressure. Has the bubble burst? Hardly. I feel it's important to point out the during the 10% or so correction in AAPL shares, nothing fundamentally has changed at the world's largest technology company. The only thing that may have changed is how you now feel about it, and that's no basis on which to make decisions.