Backing buffer facet

[tbrent]

Results from running this on mainnet on the largest 3 RTokens

- ETH+: $330k required buffer; has $337k
- USD3: $35k required buffer; has $39k
- eUSD: $2,300 required buffer; has $7500

(makes sense, because recall eUSD buffer is set too low atm)

[julianmrodri]

LGTM, fixed a small typo

[openzeppelin-code]

Backing buffer facet

Generated at commit: a4801781660d5c150c68c593ba94ce0e14c9a8b2

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	3 3 0 15 37 58
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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For more details view the full report in OpenZeppelin Code Inspector