Update standards/SPIFFE_Trust_Domain_and_Bundle.md
Update standards/SPIFFE_Trust_Domain_and_Bundle.md

passive voice sounded strange
it's not 1:1; we just said in the previous paragraph that it's 1:N

Co-Authored-By: Spike Curtis <73cc33b96ddcddc98995c569e3a0bca29451c8a8@spikecurtis.com>
Signed-off-by: Evan Gilman <178b62e73cc3fab9e30bf27b2372c9ff92401915@scytale.io>

spiffe/spiffe