[Couchdb Wiki] Trivial Update of "SignedDocuments" by JensAlfke

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The following page has been changed by JensAlfke:
http://wiki.apache.org/couchdb/SignedDocuments

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   * `date`: The time the signature was generated.
   * `expires`: The number of seconds the signature remains valid after being generated.
   * `signer`: A nested object describing the "identity" (aka "principal" or "signer") that generated the signature:
-  ** `nickname`: A brief human-readable name for this identity. It can't be trusted to mean anything or be unique; it’s just a convenience for use when inspecting the signature, or for using as a default display-name in a UI.
+    * `nickname`: A brief human-readable name for this identity. It can't be trusted to mean anything or be unique; it’s just a convenience for use when inspecting the signature, or for using as a default display-name in a UI.
-  ** `publicKey`: The actual public key that uniquely identifies the signer. It's composed of sub-fields: `algorithm` identifies the type of key, `bits` is the number of bits in the key, and `data` is the base64-encoded key data itself.
+    * `publicKey`: The actual public key that uniquely identifies the signer. It's composed of sub-fields: `algorithm` identifies the type of key, `bits` is the number of bits in the key, and `data` is the base64-encoded key data itself.
  
  == Generating and Checking Digests ==