Jeremy Stanley 97c58d7a73 Document documenting rotated signing keys
There's now a section of the releases site which we use to document
our current and past artifact signing keys. For completeness,
update the signing implementation instructions with directions for
keeping that current.

Change-Id: If25d9e868fbdd7aeb1157ef134e5abcc67c1c688
Depends-On: I083bc8acf8d95e938afb5446d786eedf4fc43751
2016-12-12 20:02:00 +00:00
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