Errors in the documentation

[luisfabib]

All documentation-related errors are collected in this issue

[luisfabib]

Errors in 0.9.0

• [x] fitbackground(t,V,@…) should be fitbackground(V,t,@…)
• [x] fitsignal some outputs are reversed
• [x] Annotate which ex_ models can be used for 3-pulse or 2+1 experiments

[luisfabib]

Errors in 0.9.1

• [ ] fitsignal does not describe the output variable containing the fit confidence intervals