sequence diagrams don't support participant aliasing

[gibson042]

Per http://bramp.github.io/js-sequence-diagrams/#syntax , participant {actor} as {alias} should be accepted.

[xax]

JS Sequence Diagrams uses participant <ID> as <ALIAS> the other way round, compared to mermaid.

JS Sequence Diagrams:

  participant Alice as A
  participant Bob as B
  A->>B: initialize something

Mermaid:

sequenceDiagram
  participant A as Alice
  participant B as Bob
  A->>B: initialize something

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