Enhance base proof with bbsHeader and PK: grammar/punctuation fixes.

Co-authored-by: Ted Thibodeau Jr <[email protected]>

index.html

@@ -720,7 +720,7 @@ <h4>createDisclosureData</h4>
             <li>
 Set `bbsProof` to the value computed by the `ProofGen` procedure from
 [[CFRG-BBS-SIGNATURE]], i.e. `ProofGen(PK, signature, header, ph, messages, disclosed_indexes)`,
-where `PK` is the original issuers public key `publicKey`, `signature` is the
+where `PK` is the original issuer's public key `publicKey`, `signature` is the
 `bbsSignature`, `header` is the `bbsHeader`, `ph` is an empty byte array,
 `messages` is `bbsMessages`, and `disclosed_indexes` is `selectiveIndexes`.
             </li>