Example 1: clarify signature generation

[Fak3]

The example say:

// Finally we sign this object with cryptographic material from
  // Alyssa's Car's capabilityDelegation field, and using the
  // capabilityDelegation proofPurpose.

It is unclear, who is meant by "we", i.e who generates the signature and possesses the private key

[Fak3]

It also mentions "cryptographic material from Alyssa's Car's capabilityDelegation field"

• The term cryptographic material is confusing.
• It is unclear how a car can have capabilityDelegation field - is it in a document stored somewhere?

[sicmade]

G

[TallTed]

To help respondents to the issue, the referenced text is here in the source and within Example 1 here in the preview.