Fix example in implementer overview

[ottomorac]

This PR addresses #228, it clarifies the example usage of how to call the resolve function in the Implementer Overview paragraph.

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[TallTed]

Suggested change

	For example, a wallet app could resolve <code>did:example:123</code>
	using the `versionTime` resolution option for instance:
	<code>resolve("did:example:123", {"versionTime":"2021-05-10T17:00:00Z"})</code>
	to retrieve the state of that DID at a past time. Or a client could dereference a DID URL
	like <code>did:example:123?service=files&relativeRef=/resume.pdf</code>
	(see <a href="#example-dereferencing-to-service-endpoint-url">here for detailed example</a>)
	to fetch a user's resume stored via a service declared in the DID document.
	For example, to retrieve the state of the DID <code>did:example:123</code>
	at a past time, a wallet app could resolve the DID with the `versionTime`
	resolution option, as in the following:<br>
	<code>resolve("did:example:123", {"versionTime":"2021-05-10T17:00:00Z"})</code>
	Or, to fetch a user's resume stored via a service declared in the DID
	document, a client could dereference a DID URL like this:
	<code>did:example:123?service=files&relativeRef=/resume.pdf</code>
	(See <a href="#example-dereferencing-to-service-endpoint-url">a more
	detailed example</a>.)

[wip-abramson]

Given the DID URL Path discussion, we may want to avoid using relativeRef in this example.

[ottomorac]

Thanks @TallTed for the observation on clarity. I will update the PR with your wording on the first example.

Also thanks to @wip-abramson for the observation around the second example using relativeRef. However my PR is not intended to modify that second example. Perhaps we can address in a separate issue after the DID Path discussion is more settled?

[ottomorac]

Updated PR with changes suggested by @talltree

[dmitrizagidulin]

Suggested change

	at a past time, a wallet app could resolve the DID with the `versionTime`
	at a past time, a client application could resolve the DID with the `versionTime`

[TallTed]

Suggested change

	at a past time, a wallet app could resolve the DID with the `versionTime`
	at a time in the past, a client application could resolve the DID with the `versionTime`