adding bandshift params + fixing docs + other small fix

[sgiardie]

Adding bandpass shift params defaults in Foreground.yaml + expanding the docs + fixing the example yaml file

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.24%. Comparing base (91779eb) to head (191a41e).

Additional details and impacted files

[](https://app.codecov.io/gh/simonsobs/LAT_MFLike/pull/93?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=simonsobs) ```diff @@ Coverage Diff @@ ## master #93 +/- ## ======================================= Coverage 85.24% 85.24% ======================================= Files 3 3 Lines 454 454 ======================================= Hits 387 387 Misses 67 67 ``` | [Files with missing lines](https://app.codecov.io/gh/simonsobs/LAT_MFLike/pull/93?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=simonsobs) | Coverage Δ | | |---|---|---| | [mflike/foreground.py](https://app.codecov.io/gh/simonsobs/LAT_MFLike/pull/93?src=pr&el=tree&filepath=mflike%2Fforeground.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=simonsobs#diff-bWZsaWtlL2ZvcmVncm91bmQucHk=) | `89.24% <ø> (ø)` | | | [mflike/mflike.py](https://app.codecov.io/gh/simonsobs/LAT_MFLike/pull/93?src=pr&el=tree&filepath=mflike%2Fmflike.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=simonsobs#diff-bWZsaWtlL21mbGlrZS5weQ==) | `82.75% <ø> (ø)` | |

[xgarrido]

Fine to merge