Do some editorial adjustments to the Sensor algorithms.

[rakuco]

• Use Web IDL's definition conventions for methods and getters (whatwg/webidl#882):

  • Describe getters as "The attr getter steps are [...]".
  • Describe methods as "The myMethod(arg) method steps are [...]".

• Refer to [=this=] as defined in Web IDL rather than a concept that was not defined anywhere.

• Use [=this=] rather than the sensor_instance variable where possible, as the latter was not defined anywhere.

• When invoking the "notify error" abstract operation, pass the arguments in the order expected by the operation.

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[anssiko]

@rakuco, thanks for this PR, I'll merge this now and we can handle any follow-ups later.