Use the apostrophe with articles preceding the acronym API.

In italian acronym could be preceded by apostrophe when the pronunciation flow smoothly. When an article, or articled preposition, precedes the acronym API the pronunciation always flow smoothly:
* if you read "API" as one word;
* if you read "API" as single italian letters: "a", "p", "i";
* if you read "API" as single english letters: "ei", "pi", "ai";
* if you read "API" thinking at "Interface" in Application Program Interface.
Copy last index.md fixes into the v2.0.0.md