Update FundingVault.sol: Structs packing and much more

[0xScratch]

The main aim of this PR was to improve that struct milestone by ordering its elements such that the use of an extra slot could be avoided. If still not cleared why this change was made - Prefer this

Also, there are some grammatical and typos which got fixed Enhanced the code readability by changing don't -> dont. Why this one? Try taking a look at the current file, As we scroll down it's uneasy to read it up.

Thanks! @hellwolf

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