Update Middleware.md (#3299)
Update Middleware.md (#3299)

Just a sentence correction that will help readers in understanding it more clearly.
hkernbach/arangodb,hkernbach/arangodb,arangodb/arangodb,fceller/arangodb,wiltonlazary/arangodb,arangodb/arangodb,graetzer/arangodb,hkernbach/arangodb,arangodb/arangodb,wiltonlazary/arangodb,Simran-B/arangodb,hkernbach/arangodb,arangodb/arangodb,Simran-B/arangodb,Simran-B/arangodb,hkernbach/arangodb,hkernbach/arangodb,graetzer/arangodb,arangodb/arangodb,arangodb/arangodb,wiltonlazary/arangodb,graetzer/arangodb,wiltonlazary/arangodb,fceller/arangodb,hkernbach/arangodb,graetzer/arangodb,Simran-B/arangodb,graetzer/arangodb,fceller/arangodb,arangodb/arangodb,fceller/arangodb,wiltonlazary/arangodb,Simran-B/arangodb,wiltonlazary/arangodb,fceller/arangodb,hkernbach/arangodb,fceller/arangodb,graetzer/arangodb,graetzer/arangodb,hkernbach/arangodb,fceller/arangodb,wiltonlazary/arangodb,fceller/arangodb,wiltonlazary/arangodb,hkernbach/arangodb,fceller/arangodb,Simran-B/arangodb,hkernbach/arangodb,graetzer/arangodb,fceller/arangodb,hkernbach/arangodb,hkernbach/arangodb,arangodb/arangodb,graetzer/arangodb,Simran-B/arangodb,graetzer/arangodb,graetzer/arangodb,Simran-B/arangodb,graetzer/arangodb,Simran-B/arangodb,graetzer/arangodb,Simran-B/arangodb,graetzer/arangodb,hkernbach/arangodb