Add a section to Michelson Encoder doc about the breaking change, fix TypeCheck method example

[ac10n]

Closes #2969

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[dsawali]

typo 'please not'

[dsawali]

same typo here "please not"

[dsawali]

I feel like these sentences can be improved a little bit, I think I understand them because I have context. Maybe something like

Please note that nested field numbers are unpredictable. Field numbers are assigned in the order of where their parent is encountered during the traversal of the tree.

What do you think?

[dsawali]

lgtm, thanks Ali