Update README.md

README.md

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 # documentation
 Where we write stuff about writing stuff
 
-Advice notes and useful lists for people running and working on disinformation deployments.  Most of these have been subsumed into the team guide, [The Big Book of Disinformation Response]('/BigBookOfDisinformationResponse')
+Advice notes and useful lists for people running and working on disinformation deployments.  Most of these have been subsumed into the team guide, [The Big Book of Disinformation Response](/BigBookOfDisinformationResponse)
 
 ## Managing a Disinformation Deployment