88fd556a969d1120a0ff633bc384336388a11709 Use placeholder instead of key expiration date (Hennadii Stepanov)
Pull request description:
Use a placeholder instead of the actual expiration date, so that the documentation doesn't require updating every time an expiry date changes.
ACKs for top commit:
fanquake:
ACK 88fd556a969d1120a0ff633bc384336388a11709
Tree-SHA512: 391707833cc0e701cf560ec82fd91368468c90a95f85e4ce2a211b20d12463c85775142f28a3536b57c5f6950b9e6e0785632f6f071fa2180bc8aab53008603b