Update vocabulary.html

[mode80]

A common point of confusion is that bitcoin wallets contain bitcoins. This makes concepts like wallet backup confusing. This seems an ideal place to clear that up. Also, as long as we're drawing the distinction with credit cards here, this wording makes that clearer.

[saivann]

I overall agree with the idea. People indeed often think their wallet contain some kind of "physical Bitcoin". However, let's wait for the opinion of others when they have time for it.

Note : you forgot to close the link tag on "blockchain".

[saivann]

I'm not sure if this one makes sense :

This is different to credit cards where funds are removed by the merchant

Isn't the initial one clearer?

This is different to credit cards where you are charged by the merchant

Also, a few HTML tags are not closed correctly

<a href="private-key"></a>private keys</a>

should be

<a href="private-key">private keys</a>

And

<a href="#blockchain">blockchain

should be

<a href="#blockchain">blockchain</a>

I agree with the rest.

[luke-jr]

Perhaps it should be rephrased to avoid giving the impression that addresses contain coins.

[saivann]

I've pushed an update containing parts of initial mode80 pull request. I didn't want this issue to disappear without being fixed.