Update occurrences of "may not" to "must not" (matching RFC 2119) #813
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"May not" has opposite colloquial and formal interpretations, which is why a lot of documents follow https://www.ietf.org/rfc/rfc2119.txt and use "must not" to avoid any ambiguity.
This PR updates all occurrences of "may not" to "must not", as they all seem to indicate an absolute prohibition.
Addresses: #812