Merge #128: Make function argument name consistent with doc

cc82ad5 Make function argument name consistent with doc (Sanket Kanjalkar)

Pull request description:

ACKs for top commit:
  real-or-random:
    ACK cc82ad5

Tree-SHA512: ef0f4ee36452dc98fa39677c567313a35b067926c76a8e5c33ae5260d1c672d872a4be1c5ebfbdb3e75d0c70ed1bb7f3dcbc592b932cef8af38cdcd154784a98

Author: jonasnick

include/secp256k1_generator.h

@@ -82,7 +82,7 @@ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_generator_generate(
 SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_generator_generate_blinded(
     const secp256k1_context* ctx,
     secp256k1_generator* gen,
-    const unsigned char *key32,
+    const unsigned char *seed32,
     const unsigned char *blind32
 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);