Tweaks to Adam

[MichaelClerx]

Also played with boundaries, but that just caused the method to run out of momentum & get stuck so abandoned the idea.

Made a PR anyway because in the meantime I

• added pseudo code
• added two values to its logging output
• improved testing & fixed a bug in the irpropmin test

[MichaelClerx]

Not at all urgent, but would still be nice if you could have a look @DavAug

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (931d02b) 100.00% compared to head (9609376) 100.00%.

:exclamation: Current head 9609376 differs from pull request most recent head 6ca0d19. Consider uploading reports for the commit 6ca0d19 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1469   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           97        97           
  Lines         9532      9530    -2     
=========================================
- Hits          9532      9530    -2     

Impacted Files	Coverage Δ
pints/_optimisers/_adam.py	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[MichaelClerx]

Anyone feel like reviewing this @pints-team/devs ? It's mostly just documentation improvements! 5 minute job