click the link, it's not [sic] so much as Muphry's law is not to be confused with Murphy's.

"Muphry's law is an adage that states that when a person criticises another's editing or proofreading, there will be a mistake of a similar kind in that criticism. The name is a deliberate misspelling of Murphy's law."

"The name is a deliberate misspelling of Murphy's law." - from the linked Wikipedia article; emphasis mine

If you follow the link, you'll see:

> Not to be confused with Murphy's law.