documentation: update cvsimport description of "-r" for recent clone
documentation: update cvsimport description of "-r" for recent clone

the "--use-separate-remote" option no longer exists, having since
become the default for a clone.

Signed-off-by: Carlo Marcelo Arenas Belon <a799130fe4873cad0b28326d5f5ccb2cdc6e1724@sajinet.com.pe>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git