Include in docs how to check events

[alilloig]

Closes #202

Description

Updates the sendTransaction of the docs to give a more detailed view on the result object that can be captured from the tx execution, giving some hints on how to check events from that

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[alilloig]

I would like the @onflow/fcl folks to take a look at the array returned by sendTransaction. For the first signature we suggest that it's an array containing result and errors [result, error] , while for the second signature we say it also includes an object call logs [result, error, logs] .

If I use the second signature and log the result I get

    [
      {
        blockId: '',
        status: 4,
        statusString: 'SEALED',
        statusCode: 0,
        errorMessage: '',
        events: [ [Object] ]
      },
      null
    ]

So I'd say the first one is true, but I'd love you folks to confirm that.

[alilloig]

As always for docs a check on use of english from any native speaker will be highly appreciated!!