Documentation: updated test section to mention the new testbed page.
Documentation: updated test section to mention the new testbed page.

catataw/echidna,rrrene/echidna,w3c/echidna,catataw/echidna,rrrene/echidna,rrrene/echidna,catataw/echidna,w3c/echidna,w3c/echidna