Merge bitcoin#651: Fix typo in secp256k1_preallocated.h

b1e68cb Fix typo in secp256k1_preallocated.h (Jan Xie)

Pull request description:

ACKs for commit b1e68c:
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    ACK b1e68cb
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Tree-SHA512: ccd51ac687193cb8be34f7388b20d002773df574a52ba6dd85cf6fd69241c079eed0f624f2e72d5e8922edc07d51923831057377a9c6550e8e072bff43854bda

include/secp256k1_preallocated.h

@@ -14,12 +14,12 @@ extern "C" {
  *
  * Context objects created by functions in this module can be used like contexts
  * objects created by functions in secp256k1.h, i.e., they can be passed to any
- * API function that excepts a context object (see secp256k1.h for details). The
+ * API function that expects a context object (see secp256k1.h for details). The
  * only exception is that context objects created by functions in this module
  * must be destroyed using secp256k1_context_preallocated_destroy (in this
  * module) instead of secp256k1_context_destroy (in secp256k1.h).
  *
- * It is guaranteed that functions in by this module will not call malloc or its
+ * It is guaranteed that functions in this module will not call malloc or its
  * friends realloc, calloc, and free.
  */