Update PhaseQuad user example

[raquelalvarezbanos]

Write a more useful doc test for PhaseQuad algorithm. Currently, in the user example, only two spectra are loaded from a muon dataset, and some counts in the input workpsace are checked. Something related to the output workpsace should be tested instead, and, given that the algorithm will typically be used with a complete dataset, all spectra should be loaded. Also, add a second user example to illustrate how to use the algorithm when a phase table is given as input.

[raquelalvarezbanos]

This issue was originally trac ticket 11191